diff --git a/templates/rrs/base_toplevel.html b/templates/rrs/base_toplevel.html
index 9804c03..fd0c96c 100644
--- a/templates/rrs/base_toplevel.html
+++ b/templates/rrs/base_toplevel.html
@@ -66,7 +66,7 @@
                     </span>
                     <ul class="nav">
                         <li class="divider-vertical"></li>
-                        <li class="lead" id="percentage"><strong>{{ recipes_percentage }}%</strong> done</li>
+                        <li class="lead" id="percentage" data-toggle="tooltip" title="Upgrades done in the period divided by recipes not updated at the beginning of the period"><strong>{{ recipes_percentage }}%</strong> Updated</li>
                         <li class="divider-vertical"></li>
                         <li class="lead" id="up-to-date-recipes">Up-to-date: <span class="text-success">{{ recipes_up_to_date }}</strong></li>
                         <li class="divider-vertical"></li>