diff --git a/vscode.proposed.d.ts b/vscode.proposed.d.ts
index 4c4b4f9be6..0f03150ffe 100644
--- a/vscode.proposed.d.ts
+++ b/vscode.proposed.d.ts
@@ -660,6 +660,13 @@ declare module 'vscode' {
 		dispose(): void;
 	}
 
+	export interface NotebookDocumentShowOptions {
+		viewColumn?: ViewColumn;
+		preserveFocus?: boolean;
+		preview?: boolean;
+		selection?: NotebookCellRange;
+	}
+
 
 	export namespace notebook {
 		export function registerNotebookContentProvider(
@@ -727,6 +734,7 @@ declare module 'vscode' {
 		export const onDidChangeActiveNotebookEditor: Event<NotebookEditor | undefined>;
 		export const onDidChangeNotebookEditorSelection: Event<NotebookEditorSelectionChangeEvent>;
 		export const onDidChangeNotebookEditorVisibleRanges: Event<NotebookEditorVisibleRangesChangeEvent>;
+		export function showNotebookDocument(document: NotebookDocument, options?: NotebookDocumentShowOptions): Promise<NotebookEditor>;
 	}
 
 	//#endregion