diff --git a/ippisite/ippidb/templates/base.html b/ippisite/ippidb/templates/base.html
index 33a953831c7bcd39cec849bf7ee2c76b369fe289..2658a79ca5ca20ef5c0d3f5d6238865c8dd59212 100644
--- a/ippisite/ippidb/templates/base.html
+++ b/ippisite/ippidb/templates/base.html
@@ -139,7 +139,7 @@
                             callbacks: {
                                 label: function(tooltipItem, data) {
                                     var dataItem = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
-                                    return "compound " + dataItem.id + " on PPI " + dataItem.family_name;
+                                    return "compound " + dataItem.id + " on PPI family " + dataItem.family_name;
                                 }
                             }
                         }