From a42cb20975133537fb24c4b68dfe99350663ca0e Mon Sep 17 00:00:00 2001
From: Steven Orvell <sorvell@google.com>
Date: Mon, 6 Feb 2017 15:46:55 -0800
Subject: [PATCH] Add comment.

---
 src/lib/annotations/annotations.html | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/lib/annotations/annotations.html b/src/lib/annotations/annotations.html
index e7408a23df..a1046afc67 100644
--- a/src/lib/annotations/annotations.html
+++ b/src/lib/annotations/annotations.html
@@ -369,10 +369,13 @@
         if (node.localName === 'input' && origName === 'value') {
           node.setAttribute(origName, '');
         }
-        // Remove annotation
+        // Support `disable-upgrade` feature by maintaining this
+        // attribute so that it can be found on an element at
+        // `createdCallback` time.
         if (disableUpgradeEnabled && origName === 'disable-upgrade$') {
           node.setAttribute(name, '');
         }
+        // Remove annotation
         node.removeAttribute(origName);
         // Case hackery: attributes are lower-case, but bind targets
         // (properties) are case sensitive. Gambit is to map dash-case to