diff --git a/app/views/users/edit.html.erb b/app/views/users/edit.html.erb
index 3f389a150..906d842f2 100644
--- a/app/views/users/edit.html.erb
+++ b/app/views/users/edit.html.erb
@@ -54,7 +54,7 @@
           <textarea id="user_favorite_tags" class="text optional" rows="5" name="user[favorite_tags]" cols="40"><%= raw @user.favorite_tags %></textarea>
           <span class="hint">A list of tags that you use often. They will appear when using the list of Related Tags.</span>
         </div>
-        <%= f.input :custom_style, :label => "Custom <a href='http://en.wikipedia.org/wiki/Cascading_Style_Sheets'>CSS</a> style" %>
+        <%= f.input :custom_style, :label => "Custom <a href='http://en.wikipedia.org/wiki/Cascading_Style_Sheets'>CSS</a> style", :hint => "Style to apply to the whole site. Cannot include angle brackets, quotes, or ampersands (< > \" ' &)." %>
       </fieldset>
 
       <fieldset id="change-password-section">