Index: app/helpers/issues_helper.rb
===================================================================
--- app/helpers/issues_helper.rb	(revision 3612)
+++ app/helpers/issues_helper.rb	(working copy)
@@ -52,7 +52,7 @@
                                                                       :style => "padding-left: #{level * 20}px") +
              content_tag('td', h(child.status)) +
              content_tag('td', link_to_user(child.assigned_to)) +
-             content_tag('td', progress_bar(child.done_ratio, :width => '80px')),
+             content_tag('td', progress_bar(child.done_ratio, :width => '80px', :legend => "#{child.done_ratio}%")),
              :class => "issue-#{child.id} hascontextmenu")
     end
     s << '</form></table>'