diff --git a/typings/xterm.d.ts b/typings/xterm.d.ts
index 940e3a48..64ef2a08 100644
--- a/typings/xterm.d.ts
+++ b/typings/xterm.d.ts
@@ -268,7 +268,8 @@ declare module 'xterm' {
     windowOptions?: IWindowOptions;
 
     /**
-     * The width, in pixels, of the canvas for the overview ruler.
+     * The width, in pixels, of the canvas for the overview ruler. The overview
+     * ruler will be hidden when not set.
      */
     overviewRulerWidth?: number;
   }