diff --git a/plugins/gmaps-heatmap/gmaps-heatmap.js b/plugins/gmaps-heatmap/gmaps-heatmap.js
index a8df9715..b28c93c9 100644
--- a/plugins/gmaps-heatmap/gmaps-heatmap.js
+++ b/plugins/gmaps-heatmap/gmaps-heatmap.js
@@ -247,7 +247,7 @@
     this.data = d;
     this.update();
   };
-  // experimential. not ready yet.
+  // experimental. not ready yet.
   HeatmapOverlay.prototype.addData = function(pointOrArray) {
     if (pointOrArray.length > 0) {
         var len = pointOrArray.length;
diff --git a/plugins/leaflet-heatmap/leaflet-heatmap.js b/plugins/leaflet-heatmap/leaflet-heatmap.js
index 5f93f0b6..f2d276d3 100644
--- a/plugins/leaflet-heatmap/leaflet-heatmap.js
+++ b/plugins/leaflet-heatmap/leaflet-heatmap.js
@@ -180,7 +180,7 @@
     
       this._draw();
     },
-    // experimential... not ready.
+    // experimental... not ready.
     addData: function(pointOrArray) {
       if (pointOrArray.length > 0) {
         var len = pointOrArray.length;
@@ -243,4 +243,4 @@
   })();
 
   return HeatmapOverlay;
-});
\ No newline at end of file
+});
diff --git a/tests/visual/plugin-modules/gmaps-heatmap.js b/tests/visual/plugin-modules/gmaps-heatmap.js
index 9d3e4983..16242b53 100644
--- a/tests/visual/plugin-modules/gmaps-heatmap.js
+++ b/tests/visual/plugin-modules/gmaps-heatmap.js
@@ -248,7 +248,7 @@
     this.data = d;
     this.update();
   };
-  // experimential. not ready yet.
+  // experimental. not ready yet.
   HeatmapOverlay.prototype.addData = function(pointOrArray) {
     if (pointOrArray.length > 0) {
         var len = pointOrArray.length;