diff --git a/src/root/build-deps.tt b/src/root/build-deps.tt
index 157b113e..f15342fa 100644
--- a/src/root/build-deps.tt
+++ b/src/root/build-deps.tt
@@ -4,6 +4,6 @@
 
 <div class="dep-tree">
   <ul class="tree">
-    [% INCLUDE renderNode node=buildTimeGraph %]
+    [% INCLUDE renderNode node=buildTimeGraph isRoot=1 %]
   </ul>
 </div>
diff --git a/src/root/deps.tt b/src/root/deps.tt
index a2c1fbba..6daa9725 100644
--- a/src/root/deps.tt
+++ b/src/root/deps.tt
@@ -19,9 +19,16 @@
           <tt>[% node.name %]</tt> (<em>no info</em>)
         [% END %]
       </span></span>
+      [% IF isRoot %]
+      <span class="dep-tree-buttons">
+        (<a href="#" class="tree-collapse-all">collapse all</a>
+        &ndash;
+        <a href="#" class="tree-expand-all">expand all</a>)
+      </span>
+      [% END %]
       [% IF node.refs.size > 0 %]
         <ul class="subtree">
-          [% FOREACH ref IN node.refs; INCLUDE renderNode node=ref; END %]
+          [% FOREACH ref IN node.refs; INCLUDE renderNode node=ref isRoot=0; END %]
         </ul>
       [% END %]
     [% END %]
diff --git a/src/root/static/css/hydra.css b/src/root/static/css/hydra.css
index 3b50d246..aac3f1ea 100644
--- a/src/root/static/css/hydra.css
+++ b/src/root/static/css/hydra.css
@@ -33,6 +33,11 @@ span:target > span.dep-tree-line {
     font-weight: bold;
 }
 
+span.dep-tree-buttons {
+    font-style: italic;
+    padding-left: 10px;
+}
+
 span.disabled-project, span.disabled-jobset, span.disabled-job {
     text-decoration: line-through;
 }