diff --git a/docs/tutorial/conf_files/volvox.json b/docs/tutorial/conf_files/volvox.json
index 8abdc62d9f..4de722d877 100644
--- a/docs/tutorial/conf_files/volvox.json
+++ b/docs/tutorial/conf_files/volvox.json
@@ -146,7 +146,8 @@
             "CDS" : "transcript-CDS",
             "UTR" : "transcript-UTR"
          },
-         "subfeatures" : true
+         "subfeatures" : true,
+         "onClick": "function() { alert('Ran arbitrary JavaScript!'); };"
       },
       {
          "feature" : [
diff --git a/src/JBrowse/View/Track/HTMLFeatures.js b/src/JBrowse/View/Track/HTMLFeatures.js
index 49d819e0cd..26ed176404 100644
--- a/src/JBrowse/View/Track/HTMLFeatures.js
+++ b/src/JBrowse/View/Track/HTMLFeatures.js
@@ -939,8 +939,8 @@ var HTMLFeatures = declare( BlockBased,
     _makeClickHandler: function( inputSpec, context ) {
         var track  = this;
 
-        if( typeof spec == 'function' ) {
-            inputSpec = { action: spec };
+        if( typeof inputSpec == 'function' ) {
+            inputSpec = { action: inputSpec };
         }
 
         var handler = function ( evt ) {