diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index a33fa80aad2..e740e259f91 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1586,7 +1586,8 @@ declare module 'vscode' {
 		// todo@API
 		// languages supported by kernel
 		// first is preferred
-		// languages: string[];
+		// `undefined` means all languages available in the editor
+		supportedLanguages?: string[];
 
 		// @roblourens
 		// todo@API change to `executeCells(document: NotebookDocument, cells: NotebookCellRange[], context:{isWholeNotebooke: boolean}, token: CancelationToken): void;`
diff --git a/src/vs/workbench/api/common/extHostNotebook.ts b/src/vs/workbench/api/common/extHostNotebook.ts
index 3ca6106e7e7..7e80e14cd36 100644
--- a/src/vs/workbench/api/common/extHostNotebook.ts
+++ b/src/vs/workbench/api/common/extHostNotebook.ts
@@ -126,7 +126,8 @@ export class ExtHostNotebookKernelProviderAdapter extends Disposable {
 				description: kernel.description,
 				detail: kernel.detail,
 				isPreferred: kernel.isPreferred,
-				preloads: kernel.preloads
+				preloads: kernel.preloads,
+				supportedLanguages: kernel.supportedLanguages
 			};
 		});