diff --git a/docshell/base/nsIWebNavigation.idl b/docshell/base/nsIWebNavigation.idl
index 0dac4ab8c0c..843fc7b3f9a 100644
--- a/docshell/base/nsIWebNavigation.idl
+++ b/docshell/base/nsIWebNavigation.idl
@@ -187,7 +187,7 @@ interface nsIWebNavigation : nsISupports
   readonly attribute nsIDOMDocument document;
 
  /**
-  * The current URI that is loaded.
+  * The currently loaded URI or null.
   */
   readonly attribute nsIURI currentURI;