diff --git a/webextension/popup.html b/webextension/popup.html
index 90315d2..725f234 100644
--- a/webextension/popup.html
+++ b/webextension/popup.html
@@ -36,7 +36,7 @@
         <h4>Containers</h4>
       </div>
       <div class="small-2 columns header-column">
-        <a id="sort-containers-link"><img alt="Sort Containers" class="icon" src="/img/container-sort.svg"></a>
+        <a id="sort-containers-link"><img alt="Sort Containers" title="Sort Containers" class="icon" src="/img/container-sort.svg"></a>
       </div>
     </div>
     <table class="unstriped hover">