diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index bbefeaa34fb8e5d577e8a186ee11a387942a0af0..abdd4552dc0502df39311821eb2b17716d2fbffb 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -170,7 +170,7 @@ declare module 'vscode' {
 		 * @param progress A progress callback that must be invoked for all results.
 		 * @param token A cancellation token.
 		 */
-		provideFileSearchResults(query: FileSearchQuery, options: FileSearchOptions, progress: Progress<Uri>, token: CancellationToken): Thenable<void>;
+		provideFileSearchResults?(query: FileSearchQuery, options: FileSearchOptions, progress: Progress<Uri>, token: CancellationToken): Thenable<void>;
 
 		/**
 		 * Provide results that match the given text pattern.
@@ -179,7 +179,7 @@ declare module 'vscode' {
 		 * @param progress A progress callback that must be invoked for all results.
 		 * @param token A cancellation token.
 		 */
-		provideTextSearchResults(query: TextSearchQuery, options: TextSearchOptions, progress: Progress<TextSearchResult>, token: CancellationToken): Thenable<void>;
+		provideTextSearchResults?(query: TextSearchQuery, options: TextSearchOptions, progress: Progress<TextSearchResult>, token: CancellationToken): Thenable<void>;
 	}
 
 	export interface FindTextInFilesOptions {