diff --git a/common/content/liberator.js b/common/content/liberator.js
index 384a9f31..c9124b7a 100644
--- a/common/content/liberator.js
+++ b/common/content/liberator.js
@@ -136,8 +136,8 @@ const Liberator = Module("liberator", {
 
     /**
      * @property {Object} The map of command-line options. These are
-     *     specified in the argument to the host application's -liberator
-     *     option. E.g. $ firefox -liberator '+u=tempRcFile ++noplugin'
+     *     specified in the argument to the host application's -{config.name}
+     *     option. E.g. $ firefox -vimperator '+u=/tmp/rcfile ++noplugin'
      *     Supported options:
      *         +u=RCFILE   Use RCFILE instead of .vimperatorrc.
      *         ++noplugin  Don't load plugins.
@@ -1734,8 +1734,7 @@ const Liberator = Module("liberator", {
 
         liberator.log("All modules loaded", 3);
 
-        services.add("commandLineHandler", "@mozilla.org/commandlinehandler/general-startup;1?type=" + config.name.toLowerCase(),
-            Ci.nsICommandLineHandler);
+        services.add("commandLineHandler", "@mozilla.org/commandlinehandler/general-startup;1?type=" + config.name.toLowerCase());
 
         let commandline = services.get("commandLineHandler").optionValue;
         if (commandline) {
diff --git a/muttator/components/commandline-handler.js b/muttator/components/commandline-handler.js
index 5385dd7b..fe2d0fd9 100644
--- a/muttator/components/commandline-handler.js
+++ b/muttator/components/commandline-handler.js
@@ -35,7 +35,7 @@ CommandLineHandler.prototype = {
             this.optionValue = commandLine.handleFlagWithParam(name, false);
         }
         catch (e) {
-            //"vimperator: option -vimperator requires an argument"
+            dump(name + ": option '-" + name + "' requires an argument\n");
         }
     }
 };
diff --git a/vimperator/components/commandline-handler.js b/vimperator/components/commandline-handler.js
index 4c7ee490..4fe1c51c 100644
--- a/vimperator/components/commandline-handler.js
+++ b/vimperator/components/commandline-handler.js
@@ -35,7 +35,7 @@ CommandLineHandler.prototype = {
             this.optionValue = commandLine.handleFlagWithParam(name, false);
         }
         catch (e) {
-            //"vimperator: option -vimperator requires an argument"
+            dump(name + ": option '-" + name + "' requires an argument\n");
         }
     }
 };
diff --git a/xulmus/components/commandline-handler.js b/xulmus/components/commandline-handler.js
index 4c098479..b4e07299 100644
--- a/xulmus/components/commandline-handler.js
+++ b/xulmus/components/commandline-handler.js
@@ -35,7 +35,7 @@ CommandLineHandler.prototype = {
             this.optionValue = commandLine.handleFlagWithParam(name, false);
         }
         catch (e) {
-            //"vimperator: option -vimperator requires an argument"
+            dump(name + ": option '-" + name + "' requires an argument\n");
         }
     }
 };