diff --git a/vscode.proposed.d.ts b/vscode.proposed.d.ts
index a26c1fc7b3..bed0820e02 100644
--- a/vscode.proposed.d.ts
+++ b/vscode.proposed.d.ts
@@ -529,7 +529,7 @@ declare module 'vscode' {
 		/**
 		 * Unique identifier for the backup.
 		 *
-		 * This id is passed back to your extension in `openCustomDocument` when opening a notebook editor from a backup.
+		 * This id is passed back to your extension in `openNotebook` when opening a notebook editor from a backup.
 		 */
 		readonly id: string;