diff --git a/gulp/gulp.d.ts b/gulp/gulp.d.ts
index d7a0dba57d..13c12a811f 100644
--- a/gulp/gulp.d.ts
+++ b/gulp/gulp.d.ts
@@ -28,6 +28,13 @@ declare module gulp {
          */
         buffer?: boolean;
 
+        /**
+         * The base path of a glob.
+         *
+         * Default is everything before a glob starts.
+         */
+        base?: string;
+
         /**
          * The current working directory in which to search.
          * Defaults to process.cwd().