From 65baac60551d6fba8bd09a81f3cc7a79b39e04d6 Mon Sep 17 00:00:00 2001
From: DerekRTP <55996380+DerekRTP@users.noreply.github.com>
Date: Tue, 16 Feb 2021 15:55:47 -0800
Subject: [PATCH] docs: update attribute-binding.md to correctly describe
 [attr.binding] rules (#40878)

PR Close #40878
---
 aio/content/guide/attribute-binding.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/aio/content/guide/attribute-binding.md b/aio/content/guide/attribute-binding.md
index d978ac99d8..aa531349db 100644
--- a/aio/content/guide/attribute-binding.md
+++ b/aio/content/guide/attribute-binding.md
@@ -34,7 +34,7 @@ Then, you set the attribute value with an expression that resolves to a string.
 
 <div class="alert is-helpful">
 
-When the expression resolves to `null`, Angular removes the attribute altogether.
+When the expression resolves to `null` or `undefined`, Angular removes the attribute altogether.
 
 </div>