diff --git a/src/components/views/rooms/EventTile.js b/src/components/views/rooms/EventTile.js
index f0cd0ee7bf..0b55c3aa2a 100644
--- a/src/components/views/rooms/EventTile.js
+++ b/src/components/views/rooms/EventTile.js
@@ -196,6 +196,8 @@ module.exports = withMatrixClient(React.createClass({
      */
     _onDecrypted: function() {
         // we need to re-verify the sending device.
+        // (we call onWidgetLoad in _verifyEvent to handle the case where decryption
+        // has caused a change in size of the event tile)
         this._verifyEvent(this.props.mxEvent);
         this.forceUpdate();
     },