diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 8f47466ee48..7d689ce3b6f 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1342,9 +1342,7 @@ declare module 'vscode' {
 
 	export interface NotebookEditorSelectionChangeEvent {
 		readonly notebookEditor: NotebookEditor;
-		// @rebornix
-		// todo@API show NotebookCellRange[] instead
-		readonly selection?: NotebookCell;
+		readonly selections: ReadonlyArray<NotebookCellRange>
 	}
 
 	export interface NotebookEditorVisibleRangesChangeEvent {
diff --git a/src/vs/workbench/api/common/extHostNotebook.ts b/src/vs/workbench/api/common/extHostNotebook.ts
index 59a14474356..0d330af22a8 100644
--- a/src/vs/workbench/api/common/extHostNotebook.ts
+++ b/src/vs/workbench/api/common/extHostNotebook.ts
@@ -596,10 +596,10 @@ export class ExtHostNotebookController implements ExtHostNotebookShape {
 		if (data.selections) {
 			editor.editor._acceptSelections(data.selections.selections);
 
-			this._onDidChangeNotebookEditorSelection.fire({
+			this._onDidChangeNotebookEditorSelection.fire(Object.freeze({
 				notebookEditor: editor.editor.editor,
-				selection: editor.editor.editor.selection
-			});
+				selections: editor.editor.editor.selections
+			}));
 		}
 	}