diff --git a/src/components/Edges/wrapEdge.tsx b/src/components/Edges/wrapEdge.tsx
index 60384e74..292463f0 100644
--- a/src/components/Edges/wrapEdge.tsx
+++ b/src/components/Edges/wrapEdge.tsx
@@ -140,7 +140,7 @@ export default (EdgeComponent: ComponentType<EdgeProps>) => {
         const isValidConnection = () => true;
         const isTarget = isSourceHandle;
 
-        onEdgeUpdateStart?.(event, edgeElement);
+        onEdgeUpdateStart?.(event, edgeElement, isSourceHandle);
 
         const _onEdgeUpdate = onEdgeUpdateEnd
           ? (evt: MouseEvent): void => onEdgeUpdateEnd(evt, edgeElement)
diff --git a/src/container/EdgeRenderer/index.tsx b/src/container/EdgeRenderer/index.tsx
index 21d7034f..def55e27 100644
--- a/src/container/EdgeRenderer/index.tsx
+++ b/src/container/EdgeRenderer/index.tsx
@@ -34,7 +34,7 @@ interface EdgeRendererProps {
   onEdgeMouseEnter?: (event: React.MouseEvent, edge: Edge) => void;
   onEdgeMouseMove?: (event: React.MouseEvent, edge: Edge) => void;
   onEdgeMouseLeave?: (event: React.MouseEvent, edge: Edge) => void;
-  onEdgeUpdateStart?: (event: React.MouseEvent, edge: Edge) => void;
+  onEdgeUpdateStart?: (event: React.MouseEvent, edge: Edge, isSourceHandle: boolean) => void;
   onEdgeUpdateEnd?: (event: MouseEvent, edge: Edge) => void;
   edgeUpdaterRadius?: number;
 }
diff --git a/src/container/ReactFlow/index.tsx b/src/container/ReactFlow/index.tsx
index 66dbe234..cc0ae8ea 100644
--- a/src/container/ReactFlow/index.tsx
+++ b/src/container/ReactFlow/index.tsx
@@ -123,7 +123,7 @@ export interface ReactFlowProps extends Omit<HTMLAttributes<HTMLDivElement>, 'on
   onEdgeMouseMove?: (event: ReactMouseEvent, edge: Edge) => void;
   onEdgeMouseLeave?: (event: ReactMouseEvent, edge: Edge) => void;
   onEdgeDoubleClick?: (event: ReactMouseEvent, edge: Edge) => void;
-  onEdgeUpdateStart?: (event: ReactMouseEvent, edge: Edge) => void;
+  onEdgeUpdateStart?: (event: ReactMouseEvent, edge: Edge, isSourceHandle: boolean) => void;
   onEdgeUpdateEnd?: (event: MouseEvent, edge: Edge) => void;
   edgeUpdaterRadius?: number;
   nodeTypesId?: string;
diff --git a/src/types/index.ts b/src/types/index.ts
index d24a0c12..ce257abd 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -132,7 +132,7 @@ export interface WrapEdgeProps<T = any> {
   onMouseMove?: (event: React.MouseEvent, edge: Edge) => void;
   onMouseLeave?: (event: React.MouseEvent, edge: Edge) => void;
   edgeUpdaterRadius?: number;
-  onEdgeUpdateStart?: (event: React.MouseEvent, edge: Edge) => void;
+  onEdgeUpdateStart?: (event: React.MouseEvent, edge: Edge, isSourceHandle: boolean) => void;
   onEdgeUpdateEnd?: (event: MouseEvent, edge: Edge) => void;
 }