diff --git a/common/modules/util.jsm b/common/modules/util.jsm
index 1b95dbd2..d01f97f0 100644
--- a/common/modules/util.jsm
+++ b/common/modules/util.jsm
@@ -713,6 +713,8 @@ var Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
      *    user: {string} The user name to send via HTTP Authentication.
      *    pass: {string} The password to send via HTTP Authentication.
      *
+     *    quiet: {boolean} If true, don't report errors.
+     *
      * @returns {XMLHttpRequest}
      */
     httpGet: function httpGet(url, callback, self) {