diff --git a/src/extensions/scratch3_video_sensing/debug.js b/src/extensions/scratch3_video_sensing/debug.js
index a7a304880..24603b584 100644
--- a/src/extensions/scratch3_video_sensing/debug.js
+++ b/src/extensions/scratch3_video_sensing/debug.js
@@ -1,3 +1,9 @@
+/**
+ * A debug "index" module exporting VideoMotion and VideoMotionView to debug
+ * VideoMotion directly.
+ * @file debug.js
+ */
+
 const VideoMotion = require('./lib');
 const VideoMotionView = require('./view');
 
diff --git a/src/extensions/scratch3_video_sensing/index.js b/src/extensions/scratch3_video_sensing/index.js
index 026588083..2904f5f54 100644
--- a/src/extensions/scratch3_video_sensing/index.js
+++ b/src/extensions/scratch3_video_sensing/index.js
@@ -2,7 +2,6 @@ const ArgumentType = require('../../extension-support/argument-type');
 const BlockType = require('../../extension-support/block-type');
 const Clone = require('../../util/clone');
 const log = require('../../util/log');
-const Timer = require('../../util/timer');
 
 const VideoMotion = require('./lib');