diff --git a/src/nodes/core/Node.js b/src/nodes/core/Node.js
index 048db8a97224bd..38cebd0686b55c 100644
--- a/src/nodes/core/Node.js
+++ b/src/nodes/core/Node.js
@@ -333,7 +333,6 @@ class Node extends EventDispatcher {
 	 * Generate a custom cache key for this node.
 	 *
 	 * @return {Number} The cache key of the node.
-	 * @default 0
 	 */
 	customCacheKey() {
 
diff --git a/src/nodes/lighting/AONode.js b/src/nodes/lighting/AONode.js
index cca37f21cef3a2..66257ff6f48275 100644
--- a/src/nodes/lighting/AONode.js
+++ b/src/nodes/lighting/AONode.js
@@ -1,5 +1,12 @@
 import LightingNode from './LightingNode.js';
 
+/**
+ * A generic class that can be used by nodes which contribute
+ * ambient occlusion to the scene. E.g. an ambient occlusion map
+ * node can be used as input for this module. Used in {@link NodeMaterial}.
+ *
+ * @augments LightingNode
+ */
 class AONode extends LightingNode {
 
 	static get type() {
@@ -8,10 +15,20 @@ class AONode extends LightingNode {
 
 	}
 
+	/**
+	 * Constructs a new AO node.
+	 *
+	 * @param {Node<float>} aoNode - The ambient occlusion node.
+	 */
 	constructor( aoNode = null ) {
 
 		super();
 
+		/**
+		 * The ambient occlusion node.
+		 *
+		 * @type {Node<float>}
+		 */
 		this.aoNode = aoNode;
 
 	}
diff --git a/src/nodes/lighting/AmbientLightNode.js b/src/nodes/lighting/AmbientLightNode.js
index 2f1a94b3af998d..dd53ab348611db 100644
--- a/src/nodes/lighting/AmbientLightNode.js
+++ b/src/nodes/lighting/AmbientLightNode.js
@@ -1,5 +1,10 @@
 import AnalyticLightNode from './AnalyticLightNode.js';
 
+/**
+ * Module for representing ambient lights as nodes.
+ *
+ * @augments AnalyticLightNode
+ */
 class AmbientLightNode extends AnalyticLightNode {
 
 	static get type() {
@@ -8,6 +13,11 @@ class AmbientLightNode extends AnalyticLightNode {
 
 	}
 
+	/**
+	 * Constructs a new ambient light node.
+	 *
+	 * @param {AmbientLight?} [light=null] - The ambient light source.
+	 */
 	constructor( light = null ) {
 
 		super( light );
diff --git a/src/nodes/lighting/AnalyticLightNode.js b/src/nodes/lighting/AnalyticLightNode.js
index 926cd80c24c34b..e94053d9bea011 100644
--- a/src/nodes/lighting/AnalyticLightNode.js
+++ b/src/nodes/lighting/AnalyticLightNode.js
@@ -7,6 +7,11 @@ import { hash } from '../core/NodeUtils.js';
 import { shadow } from './ShadowNode.js';
 import { nodeObject } from '../tsl/TSLCore.js';
 
+/**
+ * Base class for analytic light nodes.
+ *
+ * @augments LightingNode
+ */
 class AnalyticLightNode extends LightingNode {
 
 	static get type() {
@@ -15,31 +20,85 @@ class AnalyticLightNode extends LightingNode {
 
 	}
 
+	/**
+	 * Constructs a new analytic light node.
+	 *
+	 * @param {Light?} [light=null] - The light source.
+	 */
 	constructor( light = null ) {
 
 		super();
 
+		/**
+		 * The light source.
+		 *
+		 * @type {Light}
+		 * @default null
+		 */
 		this.light = light;
 
+		/**
+		 * The light's color value.
+		 *
+		 * @type {Color}
+		 */
 		this.color = new Color();
+
+		/**
+		 * The light's color node. Points to `colorNode` of the light source, if set. Otherwise
+		 * it creates a uniform node based on {@link AnalyticLightNode#color}.
+		 *
+		 * @type {Node}
+		 */
 		this.colorNode = ( light && light.colorNode ) || uniform( this.color ).setGroup( renderGroup );
 
+		/**
+		 * This property is used to retain a reference to the original value of {@link AnalyticLightNode#colorNode}.
+		 * The final color node is represented by a differnt node when using shadows.
+		 *
+		 * @type {Node}
+		 */
 		this.baseColorNode = null;
 
+		/**
+		 * Represents the light's shadow.
+		 *
+		 * @type {ShadowNode}
+		 */
 		this.shadowNode = null;
+
+		/**
+		 * Represents the light's shadow color.
+		 *
+		 * @type {Node}
+		 */
 		this.shadowColorNode = null;
 
+		/**
+		 * This flag can be used for type testing.
+		 *
+		 * @type {Boolean}
+		 * @readonly
+		 * @default true
+		 */
 		this.isAnalyticLightNode = true;
 
+		/**
+		 * Overwritten since analytic light nodes are updated
+		 * once per frame.
+		 *
+		 * @type {String}
+		 * @default 'frame'
+		 */
 		this.updateType = NodeUpdateType.FRAME;
 
 	}
 
 	/**
-	 * Overwrites the default `customCacheKey()` implementation by including the
-	 * light.id and light.castShadow into the cache key.
+	 * Overwrites the default {@link Node#customCacheKey} implementation by including the
+	 * `light.id` and `light.castShadow` into the cache key.
 	 *
-	 * @return {Number} The hash.
+	 * @return {Number} The custom cache key.
 	 */
 	customCacheKey() {
 
@@ -53,12 +112,24 @@ class AnalyticLightNode extends LightingNode {
 
 	}
 
+	/**
+	 * Setups the shadow node for this light. The method exists so concrete light classes
+	 * can setup different types of shadow nodes.
+	 *
+	 * @return {ShadowNode} The created shadow node.
+	 */
 	setupShadowNode() {
 
 		return shadow( this.light );
 
 	}
 
+	/**
+	 * Setups the shadow for this light. This method is only executed if the light
+	 * cast shadows and the current build object receives shadows.
+	 *
+	 * @param {NodeBuilder} builder - The current node builder.
+	 */
 	setupShadow( builder ) {
 
 		const { renderer } = builder;
@@ -97,6 +168,13 @@ class AnalyticLightNode extends LightingNode {
 
 	}
 
+	/**
+	 * Unlike most other nodes, lighting nodes do not return a output node in {@link Node#setup}.
+	 * The main purpose of lighting nodes is to configure the current {@link LightingModel} and/or
+	 * invocate the respecitve interface methods.
+	 *
+	 * @param {NodeBuilder} builder - The current node builder.
+	 */
 	setup( builder ) {
 
 		this.colorNode = this.baseColorNode || this.colorNode;
@@ -119,6 +197,13 @@ class AnalyticLightNode extends LightingNode {
 
 	}
 
+	/**
+	 * The update method is used to update light uniforms per frame.
+	 * Potentially overwritten in concrete light nodes to update light
+	 * specific uniforms.
+	 *
+	 * @param {NodeFrame} frame - A reference to the current node frame.
+	 */
 	update( /*frame*/ ) {
 
 		const { light } = this;
diff --git a/src/nodes/lighting/BasicEnvironmentNode.js b/src/nodes/lighting/BasicEnvironmentNode.js
index 50159bc4ad01d2..3f4c73b6008b25 100644
--- a/src/nodes/lighting/BasicEnvironmentNode.js
+++ b/src/nodes/lighting/BasicEnvironmentNode.js
@@ -1,6 +1,14 @@
 import LightingNode from './LightingNode.js';
 import { cubeMapNode } from '../utils/CubeMapNode.js';
 
+/**
+ * Represents a basic model for Image-based lighting (IBL). The environment
+ * is defined via environment maps in the equirectanular or cube map format.
+ * `BasicEnvironmentNode` is intended for non-PBR materials like {@link MeshBasicNodeMaterial}
+ * or {@link MeshPhongNodeMaterial}.
+ *
+ * @augments LightingNode
+ */
 class BasicEnvironmentNode extends LightingNode {
 
 	static get type() {
@@ -9,10 +17,21 @@ class BasicEnvironmentNode extends LightingNode {
 
 	}
 
+	/**
+	 * Constructs a new basic environment node.
+	 *
+	 * @param {Node} [envNode=null] - A node representing the environment.
+	 */
 	constructor( envNode = null ) {
 
 		super();
 
+		/**
+		 * A node representing the environment.
+		 *
+		 * @type {Node}
+		 * @default null
+		 */
 		this.envNode = envNode;
 
 	}
diff --git a/src/nodes/lighting/BasicLightMapNode.js b/src/nodes/lighting/BasicLightMapNode.js
index efd1942947437a..0d1ac92e8933e8 100644
--- a/src/nodes/lighting/BasicLightMapNode.js
+++ b/src/nodes/lighting/BasicLightMapNode.js
@@ -1,6 +1,13 @@
 import LightingNode from './LightingNode.js';
 import { float } from '../tsl/TSLBase.js';
 
+/**
+ * A specific version of {@link IrradianceNode} that is only relevant
+ * for {@link MeshBasicNodeMaterial}. Since the material is unlit, it
+ * requires a special scaling factor for the light map.
+ *
+ * @augments LightingNode
+ */
 class BasicLightMapNode extends LightingNode {
 
 	static get type() {
@@ -9,10 +16,20 @@ class BasicLightMapNode extends LightingNode {
 
 	}
 
+	/**
+	 * Constructs a new basic light map node.
+	 *
+	 * @param {Node<vec3>} lightMapNode - The light map node.
+	 */
 	constructor( lightMapNode = null ) {
 
 		super();
 
+		/**
+		 * The light map node.
+		 *
+		 * @type {Node<vec3>}
+		 */
 		this.lightMapNode = lightMapNode;
 
 	}
diff --git a/src/nodes/lighting/DirectionalLightNode.js b/src/nodes/lighting/DirectionalLightNode.js
index 47b4d4a16eea77..8cc7339c45be8a 100644
--- a/src/nodes/lighting/DirectionalLightNode.js
+++ b/src/nodes/lighting/DirectionalLightNode.js
@@ -1,6 +1,11 @@
 import AnalyticLightNode from './AnalyticLightNode.js';
 import { lightTargetDirection } from '../accessors/Lights.js';
 
+/**
+ * Module for representing directional lights as nodes.
+ *
+ * @augments AnalyticLightNode
+ */
 class DirectionalLightNode extends AnalyticLightNode {
 
 	static get type() {
@@ -9,6 +14,11 @@ class DirectionalLightNode extends AnalyticLightNode {
 
 	}
 
+	/**
+	 * Constructs a new directional light node.
+	 *
+	 * @param {DirectionalLight?} [light=null] - The directional light source.
+	 */
 	constructor( light = null ) {
 
 		super( light );
diff --git a/src/nodes/lighting/EnvironmentNode.js b/src/nodes/lighting/EnvironmentNode.js
index c4f3de3e6db89a..1525ebb1709e9f 100644
--- a/src/nodes/lighting/EnvironmentNode.js
+++ b/src/nodes/lighting/EnvironmentNode.js
@@ -11,6 +11,13 @@ import { pmremTexture } from '../pmrem/PMREMNode.js';
 
 const _envNodeCache = new WeakMap();
 
+/**
+ * Represents a physical model for Image-based lighting (IBL). The environment
+ * is defined via environment maps in the equirectanular, cube map or cubeUV (PMREM) format.
+ * `EnvironmentNode` is intended for PBR materials like {@link MeshStandardNodeMaterial}.
+ *
+ * @augments LightingNode
+ */
 class EnvironmentNode extends LightingNode {
 
 	static get type() {
@@ -19,10 +26,21 @@ class EnvironmentNode extends LightingNode {
 
 	}
 
+	/**
+	 * Constructs a new environment node.
+	 *
+	 * @param {Node} [envNode=null] - A node representing the environment.
+	 */
 	constructor( envNode = null ) {
 
 		super();
 
+		/**
+		 * A node representing the environment.
+		 *
+		 * @type {Node}
+		 * @default null
+		 */
 		this.envNode = envNode;
 
 	}
diff --git a/src/nodes/lighting/HemisphereLightNode.js b/src/nodes/lighting/HemisphereLightNode.js
index 67e349e74496b7..a692f548038ccf 100644
--- a/src/nodes/lighting/HemisphereLightNode.js
+++ b/src/nodes/lighting/HemisphereLightNode.js
@@ -7,6 +7,11 @@ import { renderGroup } from '../core/UniformGroupNode.js';
 
 import { Color } from '../../math/Color.js';
 
+/**
+ * Module for representing hemisphere lights as nodes.
+ *
+ * @augments AnalyticLightNode
+ */
 class HemisphereLightNode extends AnalyticLightNode {
 
 	static get type() {
@@ -15,17 +20,43 @@ class HemisphereLightNode extends AnalyticLightNode {
 
 	}
 
+	/**
+	 * Constructs a new hemisphere light node.
+	 *
+	 * @param {HemisphereLight?} [light=null] - The hemisphere light source.
+	 */
 	constructor( light = null ) {
 
 		super( light );
 
+		/**
+		 * Uniform node representing the light's position.
+		 *
+		 * @type {UniformNode<vec3>}
+		 */
 		this.lightPositionNode = lightPosition( light );
+
+		/**
+		 * A node representing the light's direction.
+		 *
+		 * @type {Node<vec3>}
+		 */
 		this.lightDirectionNode = this.lightPositionNode.normalize();
 
+		/**
+		 * Uniform node representing the light's ground color.
+		 *
+		 * @type {UniformNode<vec3>}
+		 */
 		this.groundColorNode = uniform( new Color() ).setGroup( renderGroup );
 
 	}
 
+	/**
+	 * Overwritten to updated hemisphere light specific uniforms.
+	 *
+	 * @param {NodeFrame} frame - A reference to the current node frame.
+	 */
 	update( frame ) {
 
 		const { light } = this;
diff --git a/src/nodes/lighting/IESSpotLightNode.js b/src/nodes/lighting/IESSpotLightNode.js
index c2b98b9722ffa4..b50a84c6123eb0 100644
--- a/src/nodes/lighting/IESSpotLightNode.js
+++ b/src/nodes/lighting/IESSpotLightNode.js
@@ -2,6 +2,11 @@ import SpotLightNode from './SpotLightNode.js';
 import { texture } from '../accessors/TextureNode.js';
 import { vec2 } from '../tsl/TSLBase.js';
 
+/**
+ * An IES version of the default spot light node.
+ *
+ * @augments SpotLightNode
+ */
 class IESSpotLightNode extends SpotLightNode {
 
 	static get type() {
@@ -10,6 +15,12 @@ class IESSpotLightNode extends SpotLightNode {
 
 	}
 
+	/**
+	 * Overwrites the default implementation to compute an IES conform spot attenuation.
+	 *
+	 * @param {Node<float>} angleCosine - The angle to compute the spot attenuation for.
+	 * @return {Node<float>} The spot attenuation.
+	 */
 	getSpotAttenuation( angleCosine ) {
 
 		const iesMap = this.light.iesMap;
diff --git a/src/nodes/lighting/IrradianceNode.js b/src/nodes/lighting/IrradianceNode.js
index 091f07265dbaa3..760f5486ca501c 100644
--- a/src/nodes/lighting/IrradianceNode.js
+++ b/src/nodes/lighting/IrradianceNode.js
@@ -1,5 +1,12 @@
 import LightingNode from './LightingNode.js';
 
+/**
+ * A generic class that can be used by nodes which contribute
+ * irradiance to the scene. E.g. a light map node can be used
+ * as input for this module. Used in {@link NodeMaterial}.
+ *
+ * @augments LightingNode
+ */
 class IrradianceNode extends LightingNode {
 
 	static get type() {
@@ -8,10 +15,20 @@ class IrradianceNode extends LightingNode {
 
 	}
 
+	/**
+	 * Constructs a new irradiance node.
+	 *
+	 * @param {Node<vec3>} node - A node contributing irradiance.
+	 */
 	constructor( node ) {
 
 		super();
 
+		/**
+		 * A node contributing irradiance.
+		 *
+		 * @type {Node<vec3>}
+		 */
 		this.node = node;
 
 	}
diff --git a/src/nodes/lighting/LightProbeNode.js b/src/nodes/lighting/LightProbeNode.js
index 4e148d5122739f..d017f3cf38cd2f 100644
--- a/src/nodes/lighting/LightProbeNode.js
+++ b/src/nodes/lighting/LightProbeNode.js
@@ -4,6 +4,11 @@ import { uniformArray } from '../accessors/UniformArrayNode.js';
 import { Vector3 } from '../../math/Vector3.js';
 import getShIrradianceAt from '../functions/material/getShIrradianceAt.js';
 
+/**
+ * Module for representing light probes as nodes.
+ *
+ * @augments AnalyticLightNode
+ */
 class LightProbeNode extends AnalyticLightNode {
 
 	static get type() {
@@ -12,6 +17,11 @@ class LightProbeNode extends AnalyticLightNode {
 
 	}
 
+	/**
+	 * Constructs a new light probe node.
+	 *
+	 * @param {LightProbe?} [light=null] - The light probe.
+	 */
 	constructor( light = null ) {
 
 		super( light );
@@ -20,10 +30,20 @@ class LightProbeNode extends AnalyticLightNode {
 
 		for ( let i = 0; i < 9; i ++ ) array.push( new Vector3() );
 
+		/**
+		 * Light probe represented as a uniform of spherical harmonics.
+		 *
+		 * @type {UniformArrayNode}
+		 */
 		this.lightProbe = uniformArray( array );
 
 	}
 
+	/**
+	 * Overwritten to updated light probe specific uniforms.
+	 *
+	 * @param {NodeFrame} frame - A reference to the current node frame.
+	 */
 	update( frame ) {
 
 		const { light } = this;
diff --git a/src/nodes/lighting/LightUtils.js b/src/nodes/lighting/LightUtils.js
index a5785e7800d216..395572815fa7d4 100644
--- a/src/nodes/lighting/LightUtils.js
+++ b/src/nodes/lighting/LightUtils.js
@@ -1,5 +1,17 @@
 import { Fn } from '../tsl/TSLBase.js';
 
+/** @module LightUtils **/
+
+/**
+ * Represents a `discard` shader operation in TSL.
+ *
+ * @method
+ * @param {Object} inputs - The input parameter object.
+ * @param {Node<float>} inputs.lightDistance - The distance of the light's position to the current fragment position.
+ * @param {Node<float>} inputs.cutoffDistance - The light's cutoff distance.
+ * @param {Node<float>} inputs.decayExponent - The light's decay exponent.
+ * @return {Node<float>} The distance falloff.
+ */
 export const getDistanceAttenuation = /*@__PURE__*/ Fn( ( inputs ) => {
 
 	const { lightDistance, cutoffDistance, decayExponent } = inputs;
diff --git a/src/nodes/lighting/LightingContextNode.js b/src/nodes/lighting/LightingContextNode.js
index da893a347c0577..cc28a5da1ed845 100644
--- a/src/nodes/lighting/LightingContextNode.js
+++ b/src/nodes/lighting/LightingContextNode.js
@@ -1,6 +1,13 @@
 import ContextNode from '../core/ContextNode.js';
 import { nodeProxy, float, vec3 } from '../tsl/TSLBase.js';
 
+/**
+ * `LightingContextNode` represents an extension of the {@link ContextNode} module
+ * by adding lighting specific context data. It represents the runtime context of
+ * {@link LightsNode}.
+ *
+ * @augments ContextNode
+ */
 class LightingContextNode extends ContextNode {
 
 	static get type() {
@@ -9,18 +16,59 @@ class LightingContextNode extends ContextNode {
 
 	}
 
+	/**
+	 * Constructs a new lighting context node.
+	 *
+	 * @param {LightsNode} node - The lights node.
+	 * @param {LightingModel} [lightingModel=null] - The current lighting model.
+	 * @param {Node<vec3>} [backdropNode=null] - A backdrop node.
+	 * @param {Node<float>} [backdropAlphaNode=null] - A backdrop alpha node.
+	 */
 	constructor( node, lightingModel = null, backdropNode = null, backdropAlphaNode = null ) {
 
 		super( node );
 
+		/**
+		 * The current lighting model.
+		 *
+		 * @type {LightingModel}
+		 * @default null
+		 */
 		this.lightingModel = lightingModel;
+
+		/**
+		 * A backdrop node.
+		 *
+		 * @type {Node<vec3>}
+		 * @default null
+		 */
 		this.backdropNode = backdropNode;
+
+		/**
+		 * A backdrop alpha node.
+		 *
+		 * @type {Node<float>}
+		 * @default null
+		 */
 		this.backdropAlphaNode = backdropAlphaNode;
 
 		this._value = null;
 
 	}
 
+	/**
+	 * Returns a lighting context object.
+	 *
+	 * @return {{
+	 * radiance: Node<vec3>,
+	 * irradiance: Node<vec3>,
+	 * iblIrradiance: Node<vec3>,
+	 * ambientOcclusion: Node<float>,
+	 * reflectedLight: {directDiffuse: Node<vec3>, directSpecular: Node<vec3>, indirectDiffuse: Node<vec3>, indirectSpecular: Node<vec3>},
+	 * backdrop: Node<vec3>,
+	 * backdropAlpha: Node<float>
+	 * }} The lighting context object.
+	 */
 	getContext() {
 
 		const { backdropNode, backdropAlphaNode } = this;
diff --git a/src/nodes/lighting/LightingNode.js b/src/nodes/lighting/LightingNode.js
index 2a27e23079ccca..c488f52f7a50b8 100644
--- a/src/nodes/lighting/LightingNode.js
+++ b/src/nodes/lighting/LightingNode.js
@@ -1,5 +1,10 @@
 import Node from '../core/Node.js';
 
+/**
+ * Base class for lighting nodes.
+ *
+ * @augments Node
+ */
 class LightingNode extends Node {
 
 	static get type() {
@@ -8,20 +13,24 @@ class LightingNode extends Node {
 
 	}
 
+	/**
+	 * Constructs a new lighting node.
+	 */
 	constructor() {
 
 		super( 'vec3' );
 
+		/**
+		 * This flag can be used for type testing.
+		 *
+		 * @type {Boolean}
+		 * @readonly
+		 * @default true
+		 */
 		this.isLightingNode = true;
 
 	}
 
-	generate( /*builder*/ ) {
-
-		console.warn( 'Abstract function.' );
-
-	}
-
 }
 
 export default LightingNode;
diff --git a/src/nodes/lighting/PointLightNode.js b/src/nodes/lighting/PointLightNode.js
index edc4fc8eff8c1f..a6348555e9063c 100644
--- a/src/nodes/lighting/PointLightNode.js
+++ b/src/nodes/lighting/PointLightNode.js
@@ -34,6 +34,11 @@ export const directPointLight = Fn( ( { color, lightViewPosition, cutoffDistance
 
 } );
 
+/**
+ * Module for representing point lights as nodes.
+ *
+ * @augments AnalyticLightNode
+ */
 class PointLightNode extends AnalyticLightNode {
 
 	static get type() {
@@ -42,15 +47,36 @@ class PointLightNode extends AnalyticLightNode {
 
 	}
 
+	/**
+	 * Constructs a new point light node.
+	 *
+	 * @param {PointLight?} [light=null] - The point light source.
+	 */
 	constructor( light = null ) {
 
 		super( light );
 
+		/**
+		 * Uniform node representing the cutoff distance.
+		 *
+		 * @type {UniformNode<float>}
+		 */
 		this.cutoffDistanceNode = uniform( 0 ).setGroup( renderGroup );
-		this.decayExponentNode = uniform( 0 ).setGroup( renderGroup );
+
+		/**
+		 * Uniform node representing the decay exponent.
+		 *
+		 * @type {UniformNode<float>}
+		 */
+		this.decayExponentNode = uniform( 2 ).setGroup( renderGroup );
 
 	}
 
+	/**
+	 * Overwritten to updated point light specific uniforms.
+	 *
+	 * @param {NodeFrame} frame - A reference to the current node frame.
+	 */
 	update( frame ) {
 
 		const { light } = this;
@@ -62,6 +88,9 @@ class PointLightNode extends AnalyticLightNode {
 
 	}
 
+	/**
+	 * Overwritten to setup point light specific shadow.
+	 */
 	setupShadowNode() {
 
 		return pointShadow( this.light );
diff --git a/src/nodes/lighting/RectAreaLightNode.js b/src/nodes/lighting/RectAreaLightNode.js
index c7c79d6ae3b9b3..bb033e6d76ac48 100644
--- a/src/nodes/lighting/RectAreaLightNode.js
+++ b/src/nodes/lighting/RectAreaLightNode.js
@@ -11,8 +11,13 @@ import { NodeUpdateType } from '../core/constants.js';
 const _matrix41 = /*@__PURE__*/ new Matrix4();
 const _matrix42 = /*@__PURE__*/ new Matrix4();
 
-let ltcLib = null;
+let _ltcLib = null;
 
+/**
+ * Module for representing rect area lights as nodes.
+ *
+ * @augments AnalyticLightNode
+ */
 class RectAreaLightNode extends AnalyticLightNode {
 
 	static get type() {
@@ -21,17 +26,45 @@ class RectAreaLightNode extends AnalyticLightNode {
 
 	}
 
+	/**
+	 * Constructs a new rect area light node.
+	 *
+	 * @param {RectAreaLight?} [light=null] - The rect area light source.
+	 */
 	constructor( light = null ) {
 
 		super( light );
 
+		/**
+		 * Uniform node representing the half height of the are light.
+		 *
+		 * @type {UniformNode<vec3>}
+		 */
 		this.halfHeight = uniform( new Vector3() ).setGroup( renderGroup );
+
+		/**
+		 * Uniform node representing the half width of the are light.
+		 *
+		 * @type {UniformNode<vec3>}
+		 */
 		this.halfWidth = uniform( new Vector3() ).setGroup( renderGroup );
 
+		/**
+		 * The `updateType` is set to `NodeUpdateType.RENDER` since the light
+		 * relies on `viewMatrix` which might vary per render call.
+		 *
+		 * @type {String}
+		 * @default 'render'
+		 */
 		this.updateType = NodeUpdateType.RENDER;
 
 	}
 
+	/**
+	 * Overwritten to updated rect area light specific uniforms.
+	 *
+	 * @param {NodeFrame} frame - A reference to the current node frame.
+	 */
 	update( frame ) {
 
 		super.update( frame );
@@ -61,13 +94,13 @@ class RectAreaLightNode extends AnalyticLightNode {
 
 		if ( builder.isAvailable( 'float32Filterable' ) ) {
 
-			ltc_1 = texture( ltcLib.LTC_FLOAT_1 );
-			ltc_2 = texture( ltcLib.LTC_FLOAT_2 );
+			ltc_1 = texture( _ltcLib.LTC_FLOAT_1 );
+			ltc_2 = texture( _ltcLib.LTC_FLOAT_2 );
 
 		} else {
 
-			ltc_1 = texture( ltcLib.LTC_HALF_1 );
-			ltc_2 = texture( ltcLib.LTC_HALF_2 );
+			ltc_1 = texture( _ltcLib.LTC_HALF_1 );
+			ltc_2 = texture( _ltcLib.LTC_HALF_2 );
 
 		}
 
@@ -89,9 +122,14 @@ class RectAreaLightNode extends AnalyticLightNode {
 
 	}
 
+	/**
+	 * Used to configure the internal BRDF approximation texture data.
+	 *
+	 * @param {RectAreaLightTexturesLib} ltc - The BRDF approximation texture data.
+	 */
 	static setLTC( ltc ) {
 
-		ltcLib = ltc;
+		_ltcLib = ltc;
 
 	}
 
diff --git a/src/nodes/lighting/SpotLightNode.js b/src/nodes/lighting/SpotLightNode.js
index 13a749c1eacc9a..042480e3aa45b2 100644
--- a/src/nodes/lighting/SpotLightNode.js
+++ b/src/nodes/lighting/SpotLightNode.js
@@ -7,6 +7,11 @@ import { renderGroup } from '../core/UniformGroupNode.js';
 import { lightViewPosition, lightTargetDirection, lightProjectionUV } from '../accessors/Lights.js';
 import { texture } from '../accessors/TextureNode.js';
 
+/**
+ * Module for representing spot lights as nodes.
+ *
+ * @augments AnalyticLightNode
+ */
 class SpotLightNode extends AnalyticLightNode {
 
 	static get type() {
@@ -15,18 +20,50 @@ class SpotLightNode extends AnalyticLightNode {
 
 	}
 
+	/**
+	 * Constructs a new spot light node.
+	 *
+	 * @param {SpotLight?} [light=null] - The spot light source.
+	 */
 	constructor( light = null ) {
 
 		super( light );
 
+		/**
+		 * Uniform node representing the cone cosinus.
+		 *
+		 * @type {UniformNode<float>}
+		 */
 		this.coneCosNode = uniform( 0 ).setGroup( renderGroup );
+
+		/**
+		 * Uniform node representing the penumbra cosinus.
+		 *
+		 * @type {UniformNode<float>}
+		 */
 		this.penumbraCosNode = uniform( 0 ).setGroup( renderGroup );
 
+		/**
+		 * Uniform node representing the cutoff distance.
+		 *
+		 * @type {UniformNode<float>}
+		 */
 		this.cutoffDistanceNode = uniform( 0 ).setGroup( renderGroup );
+
+		/**
+		 * Uniform node representing the decay exponent.
+		 *
+		 * @type {UniformNode<float>}
+		 */
 		this.decayExponentNode = uniform( 0 ).setGroup( renderGroup );
 
 	}
 
+	/**
+	 * Overwritten to updated spot light specific uniforms.
+	 *
+	 * @param {NodeFrame} frame - A reference to the current node frame.
+	 */
 	update( frame ) {
 
 		super.update( frame );
@@ -41,6 +78,12 @@ class SpotLightNode extends AnalyticLightNode {
 
 	}
 
+	/**
+	 * Computes the spot attenuation for the given angle.
+	 *
+	 * @param {Node<float>} angleCosine - The angle to compute the spot attenuation for.
+	 * @return {Node<float>} The spot attenuation.
+	 */
 	getSpotAttenuation( angleCosine ) {
 
 		const { coneCosNode, penumbraCosNode } = this;
diff --git a/src/nodes/utils/FunctionOverloadingNode.js b/src/nodes/utils/FunctionOverloadingNode.js
index b22db1fc85276a..a916cb64fa7c1b 100644
--- a/src/nodes/utils/FunctionOverloadingNode.js
+++ b/src/nodes/utils/FunctionOverloadingNode.js
@@ -1,6 +1,13 @@
 import Node from '../core/Node.js';
 import { nodeProxy } from '../tsl/TSLBase.js';
 
+/**
+ * This class allows to define multiple overloaded versions
+ * of the same function. Depending on the parameters of the function
+ * call, the node picks the best-fit overloaded version.
+ *
+ * @augments Node
+ */
 class FunctionOverloadingNode extends Node {
 
 	static get type() {
@@ -9,19 +16,55 @@ class FunctionOverloadingNode extends Node {
 
 	}
 
+	/**
+	 * Constructs a new function overloading node.
+	 *
+	 * @param {Array<Function>} functionNodes - Array of `Fn` function definitions.
+	 * @param {...Node} parametersNodes - A list of paramater nodes.
+	 */
 	constructor( functionNodes = [], ...parametersNodes ) {
 
 		super();
 
+		/**
+		 * Array of `Fn` function definitions.
+		 *
+		 * @type {Array<Function>}
+		 */
 		this.functionNodes = functionNodes;
+
+		/**
+		 * A list of paramater nodes.
+		 *
+		 * @type {Array<Nodes>}
+		 */
 		this.parametersNodes = parametersNodes;
 
+		/**
+		 * The selected overloaded function call.
+		 *
+		 * @private
+		 * @type {ShaderCallNodeInternal}
+		 */
 		this._candidateFnCall = null;
 
+		/**
+		 * This node is marked as global.
+		 *
+		 * @type {Boolean}
+		 * @default true
+		 */
 		this.global = true;
 
 	}
 
+	/**
+	 * This method is overwritten since the node type is inferred from
+	 * the function's return type.
+	 *
+	 * @param {NodeBuilder} builder - The current node builder.
+	 * @return {String} The node type.
+	 */
 	getNodeType() {
 
 		return this.functionNodes[ 0 ].shaderNode.layout.type;