diff --git a/README.md b/README.md
index b538b1d3..34a4300c 100644
--- a/README.md
+++ b/README.md
@@ -217,6 +217,7 @@ All props are detailed below.
 | `canDeleteNode`            | `func`                     | `false`      | Called before a node is deleted.                                                                                                                                                            |
 | `canCreateEdge`            | `func`                     | `false`      | Called before an edge is created.                                                                                                                                                           |
 | `canDeleteEdge`            | `func`                     | `false`      | Called before an edge is deleted.                                                                                                                                                           |
+| `canSwapEdge`              | `func`                     | `false`      | Called before an edge 'target' is swapped.
 | `afterRenderEdge`          | `func`                     | `false`      | Called after an edge is rendered.                                                                                                                                                           |
 | `renderNode`               | `func`                     | `false`      | Called to render node geometry.                                                                                                                                                             |
 | `renderNodeText`           | `func`                     | `false`      | Called to render the node text                                                                                                                                                              |
@@ -289,6 +290,7 @@ Prop Types:
   canDeleteNode?: (selected: any) => boolean;
   canDeleteEdge?: (selected: any) => boolean;
   canCreateEdge?: (startNode?: INode, endNode?: INode) => boolean;
+  canSwapEdge?: (sourceNode: INode, targetNode: INode, edge: IEdge) => boolean;
   afterRenderEdge?: (id: string, element: any, edge: IEdge, edgeContainer: any, isEdgeSelected: boolean) => void;
   onUndo?: () => void;
   onCopySelected?: () => void;
diff --git a/src/components/graph-view.js b/src/components/graph-view.js
index 25b930ba..5409182d 100644
--- a/src/components/graph-view.js
+++ b/src/components/graph-view.js
@@ -64,6 +64,7 @@ type IGraphViewState = {
 class GraphView extends React.Component<IGraphViewProps, IGraphViewState> {
   static defaultProps = {
     canCreateEdge: (startNode?: INode, endNode?: INode) => true,
+    canSwapEdge: () => true,
     canDeleteEdge: () => true,
     canDeleteNode: () => true,
     edgeArrowSize: 8,
@@ -456,7 +457,8 @@ class GraphView extends React.Component<IGraphViewProps, IGraphViewState> {
       hoveredNode &&
       sourceNode !== hoveredNode &&
       (swapEdge.source !== sourceNode[this.props.nodeKey] ||
-        swapEdge.target !== hoveredNode[this.props.nodeKey])
+        swapEdge.target !== hoveredNode[this.props.nodeKey]) &&
+      canSwapEdge(sourceNode, hoveredNode, swapEdge)
     );
   }