diff --git a/extensions/vscode-api-tests/src/singlefolder-tests/notebook.test.ts b/extensions/vscode-api-tests/src/singlefolder-tests/notebook.test.ts
index 8ab52e28a78..293913f62a1 100644
--- a/extensions/vscode-api-tests/src/singlefolder-tests/notebook.test.ts
+++ b/extensions/vscode-api-tests/src/singlefolder-tests/notebook.test.ts
@@ -859,12 +859,12 @@ suite('Notebook API tests', function () {
 		const p = new Promise<void>(r => resolve = r);
 		const listener = vscode.notebook.onDidChangeNotebookCellExecutionState(e => {
 			if (eventCount === 0) {
-				assert.strictEqual(e.executionState, vscode.NotebookCellExecutionState.Pending, 'should be set to Pending');
+				assert.strictEqual(e.state, vscode.NotebookCellExecutionState.Pending, 'should be set to Pending');
 			} else if (eventCount === 1) {
-				assert.strictEqual(e.executionState, vscode.NotebookCellExecutionState.Executing, 'should be set to Executing');
+				assert.strictEqual(e.state, vscode.NotebookCellExecutionState.Executing, 'should be set to Executing');
 				assert.strictEqual(cell.outputs.length, 0, 'no outputs yet: ' + JSON.stringify(cell.outputs[0]));
 			} else if (eventCount === 2) {
-				assert.strictEqual(e.executionState, vscode.NotebookCellExecutionState.Idle, 'should be set to Idle');
+				assert.strictEqual(e.state, vscode.NotebookCellExecutionState.Idle, 'should be set to Idle');
 				assert.strictEqual(cell.outputs.length, 1, 'should have an output');
 				resolve();
 			}
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 8049fdac17d..7a049465872 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1956,7 +1956,7 @@ declare module 'vscode' {
 	 */
 	// todo@api rename to notebooks?
 	// todo@api what should be in this namespace? should notebookDocuments and friends be in the workspace namespace?
-	export namespace notebook {
+	export namespace notebooks {
 
 		/**
 		 * All notebook documents currently known to the editor.
@@ -2073,7 +2073,7 @@ declare module 'vscode' {
 		readonly state: NotebookCellExecutionState;
 	}
 
-	export namespace notebook {
+	export namespace notebooks {
 
 		/**
 		 * An {@link Event} which fires when the execution state of a cell has changed.
@@ -2085,6 +2085,15 @@ declare module 'vscode' {
 
 	//#endregion
 
+	//#region https://github.com/microsoft/vscode/issues/106744, Notebook, deprecated
+
+	/**
+	 * @deprecated use notebooks instead
+	 */
+	export const notebook: typeof notebooks;
+
+	//#endregion
+
 	//#region https://github.com/microsoft/vscode/issues/106744, NotebookEditor
 
 	export enum NotebookEditorRevealType {
@@ -2207,7 +2216,7 @@ declare module 'vscode' {
 		selections?: NotebookRange[];
 	}
 
-	export namespace notebook {
+	export namespace notebooks {
 
 
 
@@ -2302,7 +2311,7 @@ declare module 'vscode' {
 		dispose(): void;
 	}
 
-	export namespace notebook {
+	export namespace notebooks {
 		export function createNotebookEditorDecorationType(options: NotebookDecorationRenderOptions): NotebookEditorDecorationType;
 	}
 
@@ -2310,7 +2319,7 @@ declare module 'vscode' {
 
 	//#region https://github.com/microsoft/vscode/issues/106744, NotebookConcatTextDocument
 
-	export namespace notebook {
+	export namespace notebooks {
 		/**
 		 * Create a document that is the concatenation of all  notebook cells. By default all code-cells are included
 		 * but a selector can be provided to narrow to down the set of cells.
@@ -2395,7 +2404,7 @@ declare module 'vscode' {
 		backupNotebook(document: NotebookDocument, context: NotebookDocumentBackupContext, token: CancellationToken): Thenable<NotebookDocumentBackup>;
 	}
 
-	export namespace notebook {
+	export namespace notebooks {
 
 		// TODO@api use NotebookDocumentFilter instead of just notebookType:string?
 		// TODO@API options duplicates the more powerful variant on NotebookContentProvider
@@ -2412,7 +2421,7 @@ declare module 'vscode' {
 		exclusive?: boolean;
 	}
 
-	export namespace notebook {
+	export namespace notebooks {
 		// SPECIAL overload with NotebookRegistrationData
 		export function registerNotebookContentProvider(notebookType: string, provider: NotebookContentProvider, options?: NotebookDocumentContentOptions, registrationData?: NotebookRegistrationData): Disposable;
 		// SPECIAL overload with NotebookRegistrationData
@@ -2486,7 +2495,7 @@ declare module 'vscode' {
 		postMessage(editor: NotebookEditor, message: TSend): void;
 	}
 
-	export namespace notebook {
+	export namespace notebooks {
 		/**
 		 * Creates a new messaging instance used to communicate with a specific
 		 * renderer. The renderer only has access to messaging if `requiresMessaging`
diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index 9cead7ebfe8..3ba64de72d2 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -1054,7 +1054,7 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 		};
 
 		// namespace: notebook
-		const notebook: typeof vscode.notebook = {
+		const notebooks: typeof vscode.notebooks = {
 			async openNotebookDocument(uriOrOptions?: URI | string, content?: vscode.NotebookData) {
 				checkProposedApiEnabled(extension);
 				let uri: URI;
@@ -1144,7 +1144,8 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			env,
 			extensions,
 			languages,
-			notebook,
+			notebooks,
+			notebook: notebooks,
 			scm,
 			tasks,
 			test,