--- a/templates/fancy.html	Sun Feb 07 22:55:52 2016 +0800
+++ b/templates/fancy.html	Sun Feb 07 22:57:31 2016 +0800
@@ -47,12 +47,13 @@
 
     <script type="application/json" id="data">{% raw json_encode(data) %}</script>
     <script>
+      var data = JSON.parse(document.getElementById('data').firstChild.nodeValue);
       var chart = c3.generate({
         bindto: '#chart',
         size: {height: 500},
-        tooltip: {format: {title: function(x) { return x; }}},
-        data: JSON.parse(document.getElementById('data').firstChild.nodeValue)
+        tooltip: {format: {title: function(x) { return data.titles[-x]; }}},
         axis: {x: {tick: {format: function(x) { return -x; }}}},
+        data: data
       });
     </script>
   </body>

--- a/viewer.py	Sun Feb 07 22:55:52 2016 +0800
+++ b/viewer.py	Sun Feb 07 22:57:31 2016 +0800
@@ -247,6 +247,7 @@
         marks, moremarks = self.getmarks()
         results, _ = self.getresults(changesets, marks=marks, colors=False)
         json = []
+        titles = {}
         for cset in changesets:
             item = {'rev': -cset['rev']}
             for mark in marks:
@@ -254,11 +255,20 @@
                 if values is not None:
                     item[mark] = values[0]
             json.append(item)
+            extra = [cset['branch']] + cset['tags']
+            if len(cset['parents']) > 1:
+                extra.append('(merge)')
+            titles[cset['rev']] = '{}:{}: {} {}'.format(
+                cset['rev'],
+                cset['node'][:12],
+                ' '.join(extra),
+                cset['desc'].partition('\n')[0])
         data = {
             'names': marks,
             'x': 'rev',
             'json': json,
-            'keys': {'x': 'rev', 'value': marks.keys()}
+            'keys': {'x': 'rev', 'value': marks.keys()},
+            'titles': titles
         }
         context = {
             'changesets': changesets,