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 06458587116..53044d0d280 100644
--- a/extensions/vscode-api-tests/src/singlefolder-tests/notebook.test.ts
+++ b/extensions/vscode-api-tests/src/singlefolder-tests/notebook.test.ts
@@ -421,29 +421,6 @@ suite('Notebook API tests', function () {
 		await saveFileAndCloseAll(resource);
 	});
 
-	test.skip('change cell language', async function () {
-		const resource = await createRandomFile('', undefined, '.vsctestnb');
-		await vscode.commands.executeCommand('vscode.openWith', resource, 'notebookCoreTest');
-
-		assert.strictEqual(vscode.window.activeNotebookEditor?.document.cells[0].language, 'typescript');
-		assert.strictEqual(vscode.window.activeNotebookEditor?.document.cells[0].cellKind, vscode.NotebookCellKind.Code);
-		await withEvent(vscode.notebook.onDidChangeCellLanguage, async event => {
-			await vscode.commands.executeCommand('notebook.cell.changeLanguage', { start: 0, end: 1 }, 'javascript');
-			await event;
-			assert.strictEqual(vscode.window.activeNotebookEditor?.document.cells[0].language, 'javascript');
-		});
-
-		// switch to markdown will change the cell kind
-		await withEvent(vscode.notebook.onDidChangeNotebookCells, async event => {
-			await vscode.commands.executeCommand('notebook.cell.changeLanguage', { start: 0, end: 1 }, 'markdown');
-			await event;
-			assert.strictEqual(vscode.window.activeNotebookEditor?.document.cells[0].language, 'markdown');
-			assert.strictEqual(vscode.window.activeNotebookEditor?.document.cells[0].cellKind, vscode.NotebookCellKind.Markdown);
-		});
-
-		await saveAllFilesAndCloseAll(resource);
-	});
-
 	test('edit API (replaceMetadata)', async function () {
 		const resource = await createRandomFile('', undefined, '.vsctestnb');
 		await vscode.commands.executeCommand('vscode.openWith', resource, 'notebookCoreTest');
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index ad83374f0e1..b3af770f100 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1558,6 +1558,7 @@ declare module 'vscode' {
 	}
 
 	// todo@API use openNotebookDOCUMENT to align with openCustomDocument etc?
+	// todo@API rename to NotebookDocumentContentProvider
 	export interface NotebookContentProvider {
 
 		readonly options?: NotebookDocumentContentOptions;