diff --git a/plugins/embed-optimizer/detect.js b/plugins/embed-optimizer/detect.js
index bb4a6fb620..9a5f93e71d 100644
--- a/plugins/embed-optimizer/detect.js
+++ b/plugins/embed-optimizer/detect.js
@@ -2,8 +2,8 @@
  * Embed Optimizer module for Optimization Detective
  *
  * When a URL metric is being collected by Optimization Detective, this module adds a ResizeObserver to keep track of
- * the changed heights for embed blocks. This data is amended onto the element data of the pending URL metric when it
- * is submitted for storage.
+ * the changed heights for embed blocks. This data is extended/amended onto the element data of the pending URL metric
+ * when it is submitted for storage.
  */
 
 const consoleLogPrefix = '[Embed Optimizer]';
@@ -16,7 +16,7 @@ const consoleLogPrefix = '[Embed Optimizer]';
  * @typedef {import("../optimization-detective/types.d.ts").InitializeArgs} InitializeArgs
  * @typedef {import("../optimization-detective/types.d.ts").FinalizeArgs} FinalizeArgs
  * @typedef {import("../optimization-detective/types.d.ts").FinalizeCallback} FinalizeCallback
- * @typedef {import("../optimization-detective/types.d.ts").AmendedElementData} AmendedElementData
+ * @typedef {import("../optimization-detective/types.d.ts").ExtendedElementData} ExtendedElementData
  */
 
 /**
@@ -76,11 +76,11 @@ export function initialize( { isDebug } ) {
 export async function finalize( {
 	isDebug,
 	getElementData,
-	amendElementData,
+	extendElementData,
 } ) {
 	for ( const [ xpath, domRect ] of loadedElementContentRects.entries() ) {
 		try {
-			amendElementData( xpath, {
+			extendElementData( xpath, {
 				resizedBoundingClientRect: domRect,
 			} );
 			if ( isDebug ) {
@@ -94,7 +94,7 @@ export async function finalize( {
 			}
 		} catch ( err ) {
 			error(
-				`Failed to amend ${ xpath } with resizedBoundingClientRect data:`,
+				`Failed to extend element data for ${ xpath } with resizedBoundingClientRect:`,
 				domRect,
 				err
 			);
diff --git a/plugins/optimization-detective/detect.js b/plugins/optimization-detective/detect.js
index e24cb5841c..3f04404118 100644
--- a/plugins/optimization-detective/detect.js
+++ b/plugins/optimization-detective/detect.js
@@ -4,8 +4,8 @@
  * @typedef {import("./types.d.ts").URLMetric} URLMetric
  * @typedef {import("./types.d.ts").URLMetricGroupStatus} URLMetricGroupStatus
  * @typedef {import("./types.d.ts").Extension} Extension
- * @typedef {import("./types.d.ts").AmendedRootData} AmendedRootData
- * @typedef {import("./types.d.ts").AmendedElementData} AmendedElementData
+ * @typedef {import("./types.d.ts").ExtendedRootData} ExtendedRootData
+ * @typedef {import("./types.d.ts").ExtendedElementData} ExtendedElementData
  */
 
 const win = window;
@@ -138,7 +138,7 @@ let urlMetric;
  * Reserved root property keys.
  *
  * @see {URLMetric}
- * @see {AmendedElementData}
+ * @see {ExtendedElementData}
  * @type {Set<string>}
  */
 const reservedRootPropertyKeys = new Set( [ 'url', 'viewport', 'elements' ] );
@@ -155,13 +155,11 @@ function getRootData() {
 }
 
 /**
- * Amends root URL metric data.
+ * Extends root URL metric data.
  *
- * @todo Would "extend" be better than "amend"? Or something else?
- *
- * @param {AmendedRootData} properties
+ * @param {ExtendedRootData} properties
  */
-function amendRootData( properties ) {
+function extendRootData( properties ) {
 	for ( const key of Object.getOwnPropertyNames( properties ) ) {
 		if ( reservedRootPropertyKeys.has( key ) ) {
 			throw new Error( `Disallowed setting of key '${ key }' on root.` );
@@ -181,7 +179,7 @@ const elementsByXPath = new Map();
  * Reserved element property keys.
  *
  * @see {ElementData}
- * @see {AmendedRootData}
+ * @see {ExtendedRootData}
  * @type {Set<string>}
  */
 const reservedElementPropertyKeys = new Set( [
@@ -210,12 +208,12 @@ function getElementData( xpath ) {
 }
 
 /**
- * Amends element data.
+ * Extends element data.
  *
- * @param {string}             xpath      XPath.
- * @param {AmendedElementData} properties Properties.
+ * @param {string}              xpath      XPath.
+ * @param {ExtendedElementData} properties Properties.
  */
-function amendElementData( xpath, properties ) {
+function extendElementData( xpath, properties ) {
 	if ( ! elementsByXPath.has( xpath ) ) {
 		throw new Error( `Unknown element with XPath: ${ xpath }` );
 	}
@@ -529,8 +527,8 @@ export default async function detect( {
 						isDebug,
 						getRootData,
 						getElementData,
-						amendElementData,
-						amendRootData,
+						extendElementData,
+						extendRootData,
 					} );
 				} catch ( err ) {
 					error(
diff --git a/plugins/optimization-detective/types.d.ts b/plugins/optimization-detective/types.d.ts
index 7668e97eb1..50b36356f8 100644
--- a/plugins/optimization-detective/types.d.ts
+++ b/plugins/optimization-detective/types.d.ts
@@ -11,7 +11,7 @@ export interface ElementData {
 	boundingClientRect: DOMRectReadOnly;
 }
 
-export type AmendedElementData = ExcludeProps<ElementData>
+export type ExtendedElementData = ExcludeProps<ElementData>
 
 export interface URLMetric {
 	url: string;
@@ -22,7 +22,7 @@ export interface URLMetric {
 	elements: ElementData[];
 }
 
-export type AmendedRootData = ExcludeProps<URLMetric>
+export type ExtendedRootData = ExcludeProps<URLMetric>
 
 export interface URLMetricGroupStatus {
 	minimumViewportWidth: number;
@@ -37,9 +37,9 @@ export type InitializeCallback = ( args: InitializeArgs ) => void;
 
 export type FinalizeArgs = {
 	readonly getRootData: () => URLMetric,
-	readonly amendRootData: ( properties: AmendedRootData ) => void,
+	readonly extendRootData: ( properties: ExtendedRootData ) => void,
 	readonly getElementData: ( xpath: string ) => ElementData|null,
-	readonly amendElementData: ( xpath: string, properties: AmendedElementData ) => void,
+	readonly extendElementData: (xpath: string, properties: ExtendedElementData ) => void,
 	readonly isDebug: boolean,
 };