From 773f2e1bbc3ef7c46ba42dcc3623d5135a8759cb Mon Sep 17 00:00:00 2001
From: Tim Mickel <tim.mickel@gmail.com>
Date: Mon, 2 May 2016 13:05:48 -0400
Subject: [PATCH] Improve JSDoc on Thread

---
 src/engine/thread.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/engine/thread.js b/src/engine/thread.js
index f7fa1dd7e..ceb643ea0 100644
--- a/src/engine/thread.js
+++ b/src/engine/thread.js
@@ -5,12 +5,13 @@
  */
 function Thread (firstBlock) {
     /**
-     * Top block of the thread
+     * ID of top block of the thread
+     * @type {!string}
      */
     this.topBlock = firstBlock;
     /**
-     * Next block that the thread will execute.
-     * @type {string}
+     * ID of next block that the thread will execute, or null if none.
+     * @type {?string}
      */
     this.nextBlock = firstBlock;
     /**