diff --git a/chrome/content/vimperator/commands.js b/chrome/content/vimperator/commands.js
index 2d20e2ca..81364d63 100644
--- a/chrome/content/vimperator/commands.js
+++ b/chrome/content/vimperator/commands.js
@@ -388,7 +388,7 @@ function Commands() //{{{
             vimperator.marks.remove(args, special);
         },
         {
-            usage: ["delm[arks]! {marks}"],
+            usage: ["delm[arks][!] {marks}"],
             short_help: "Delete the specified marks {a-zA-Z}",
             help: "Marks are presented as a list. Example:<br/>" +
                 "<code class=\"command\">:delmarks Aa b p</code> will delete marks A, a, b and p<br/>" +
diff --git a/chrome/content/vimperator/help.js b/chrome/content/vimperator/help.js
index 0dd70326..9fd80474 100644
--- a/chrome/content/vimperator/help.js
+++ b/chrome/content/vimperator/help.js
@@ -62,11 +62,13 @@ Vimperator.prototype.help = function(section, easter) //{{{
                 usage = usage.replace(/</g, "&lt;");
                 usage = usage.replace(/>/g, "&gt;");
                 usage = usage.replace(/\\n/g, "<br/>");
-                // color {count} and [url] arguments in the usage, not nice and error prone but the regexp work (for now)
-                usage = usage.replace(/(^|;|\n|\s|\]|\}|=|<br\/?>)({.*?}|\[.*?\])/gm, "$1<span class=\"argument\">$2</span>");
+                // color {count}, [!], {arg} and [arg] in the usage, not nice and error prone but the regexp work (for now)
+                usage = usage.replace(/({[^}]+})/g, "<span class=\"argument\">$1</span>");                  // required args
+                usage = usage.replace(/([^A-Za-z])(\[[^!\]]+\])/g, "$1<span class=\"argument\">$2</span>"); // optional args
+                usage = usage.replace(/\[!\]/, "<span class=\"argument\">[!]</span>");                      // special
                 // and the 'option' in a different color
                 usage = usage.replace(/^'(\w+)'/gm, "'<span class=\"option\">$1</span>'");
-                ret += "<code>" +beg+ usage +end+ '</code><br/>';
+                ret += "<code>" + beg + usage + end + '</code><br/>';
             }
             ret += '</td><td valign="top">';