diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 0f3ab9acdfb..a5b1f1b3fdf 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1534,6 +1534,7 @@ declare module 'vscode' {
 	export interface NotebookCellsChangeData {
 		readonly start: number;
 		readonly deletedCount: number;
+		readonly deletedItems: NotebookCell[];
 		readonly items: NotebookCell[];
 	}
 
diff --git a/src/vs/workbench/api/common/extHostNotebook.ts b/src/vs/workbench/api/common/extHostNotebook.ts
index 4b5325e812c..c025cbc05bf 100644
--- a/src/vs/workbench/api/common/extHostNotebook.ts
+++ b/src/vs/workbench/api/common/extHostNotebook.ts
@@ -315,11 +315,12 @@ export class ExtHostNotebookDocument extends Disposable implements vscode.Notebo
 
 			}
 
-			this.cells.splice(splice[0], splice[1], ...newCells);
+			const deletedItems = this.cells.splice(splice[0], splice[1], ...newCells);
 
 			const event: vscode.NotebookCellsChangeData = {
 				start: splice[0],
 				deletedCount: splice[1],
+				deletedItems,
 				items: newCells
 			};
 
@@ -340,10 +341,12 @@ export class ExtHostNotebookDocument extends Disposable implements vscode.Notebo
 		const changes: vscode.NotebookCellsChangeData[] = [{
 			start: index,
 			deletedCount: 1,
+			deletedItems: cells,
 			items: []
 		}, {
 			start: newIdx,
 			deletedCount: 0,
+			deletedItems: [],
 			items: cells
 		}];
 		this._emitter.emitModelChange({