From 3e8ddd19664b505a6ab4c9dd8b7c8e554ccc34b7 Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Mon, 3 Jul 2017 21:43:52 -0700
Subject: [PATCH] Add jsdoc

---
 src/Viewport.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/Viewport.ts b/src/Viewport.ts
index 6d4c1c845..5be6bffdf 100644
--- a/src/Viewport.ts
+++ b/src/Viewport.ts
@@ -123,10 +123,18 @@ export class Viewport {
     ev.preventDefault();
   };
 
+  /**
+   * Handles the touchstart event, recording the touch occurred.
+   * @param ev The touch event.
+   */
   public onTouchStart(ev: TouchEvent) {
     this.lastTouchY = ev.touches[0].pageY;
   };
 
+  /**
+   * Handles the touchmove event, scrolling the viewport if the position shifted.
+   * @param ev The touch event.
+   */
   public onTouchMove(ev: TouchEvent) {
     let deltaY = this.lastTouchY - ev.touches[0].pageY;
     this.lastTouchY = ev.touches[0].pageY;