diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index 40c420b664931..8e3d52f467dd4 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -5840,6 +5840,7 @@ declare module 'vscode' {
 		 * the command handler function doesn't return anything.
 		 */
 		export function executeCommand<T>(command: string, ...rest: any[]): Thenable<T | undefined>;
+		export function executeCommand<T>(command: 'vscode.previewHtml', error: { '⚠️ The vscode.previewHtml command is deprecated and will be removed. Please switch to using the Webview Api': never }, ...rest: any[]): Thenable<T | undefined>;
 
 		/**
 		 * Retrieve the list of all available commands. Commands starting an underscore are