diff --git a/ionic/components/scroll/scroll.ts b/ionic/components/scroll/scroll.ts
index 05e6656e99..9f22e9b6c5 100644
--- a/ionic/components/scroll/scroll.ts
+++ b/ionic/components/scroll/scroll.ts
@@ -45,8 +45,17 @@ import * as util from '../../util';
     '</scroll-content>'
 })
 export class Scroll extends Ion {
+  /**
+   * @private
+   */
   private maxScale: number = 3;
+  /**
+   * @private
+   */
   private zoomDuration: number = 250;
+  /**
+   * @private
+   */
   private scrollElement: HTMLElement;
 
   constructor(elementRef: ElementRef) {