diff --git a/src/navigator.js b/src/navigator.js
index 94452e42..cbe0780e 100644
--- a/src/navigator.js
+++ b/src/navigator.js
@@ -540,7 +540,7 @@ function onCanvasDrag( event ) {
      * @property {Boolean} shift - True if the shift key was pressed during this event.
      * @property {Object} originalEvent - The original DOM event.
      * @property {?Object} userData - Arbitrary subscriber-defined object.
-     * @property {Boolean} preventDefaultAction - Set to true to prevent default click to zoom behaviour. Default: false.
+     * @property {Boolean} preventDefaultAction - Set to true to prevent default drag to pan behaviour. Default: false.
      */
      this.viewer.raiseEvent('navigator-drag', canvasDragEventArgs);
 
diff --git a/src/viewer.js b/src/viewer.js
index 7e92c6e5..24b88109 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -2812,7 +2812,7 @@ function onCanvasDrag( event ) {
      * @property {Number} direction - Current computed direction, expressed as an angle counterclockwise relative to the positive X axis (-pi to pi, in radians). Only valid if speed > 0.
      * @property {Boolean} shift - True if the shift key was pressed during this event.
      * @property {Object} originalEvent - The original DOM event.
-     * @property {Boolean} preventDefaultAction - Set to true to prevent default drag behaviour. Default: false.
+     * @property {Boolean} preventDefaultAction - Set to true to prevent default drag to pan behaviour. Default: false.
      * @property {?Object} userData - Arbitrary subscriber-defined object.
      */
     this.raiseEvent( 'canvas-drag', canvasDragEventArgs);