diff --git a/src/ol/map.js b/src/ol/map.js
index b4bb298093..9f85dfee51 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -189,6 +189,7 @@ ol.Map = function(mapOptions) {
   this.viewport_.style.overflow = 'hidden';
   this.viewport_.style.width = '100%';
   this.viewport_.style.height = '100%';
+  // prevent page zoom on IE >= 10 browsers
   this.viewport_.style.msTouchAction = 'none';
   goog.dom.appendChild(this.target_, this.viewport_);