diff --git a/app/main/static/js/charges.js b/app/main/static/js/charges.js
index acd66a2..91f4af9 100644
--- a/app/main/static/js/charges.js
+++ b/app/main/static/js/charges.js
@@ -75,6 +75,15 @@ function build_chart(div_selector, data_url, project_name, category) {
     var mouseover = function (e, d) {
         var category_name = d3.select(this.parentNode).datum().key
         var category_charge = d.data[category_name]
+        show_tooltip(e, category_name, category_charge)
+    }
+
+    var mouseovergrouped = function (e, d) {
+        var category_name = d.key
+        var category_charge = d.value
+        show_tooltip(e, category_name, category_charge)
+    }
+    var show_tooltip = function (e, category_name, category_charge) {
         tooltip
             .transition()
             .duration(200)
@@ -165,7 +174,10 @@ function build_chart(div_selector, data_url, project_name, category) {
             .attr("y", d => yScale(d.value))
             .attr("width", xCategories.bandwidth())
             .attr("height", d => height - yScale(d.value))
-            .attr("fill", d => colorScale(d.key));
+            .attr("fill", d => colorScale(d.key))
+            .on("mouseover", mouseovergrouped)
+            .on("mousemove", mousemove)
+            .on("mouseleave", mouseleave);
 
     }
 
--
libgit2 0.21.2