From c8a1a14b87e5907458e8e87021e47f9796cb3257 Mon Sep 17 00:00:00 2001
From: Fabian Wiles <fabianwiles@live.com>
Date: Sun, 10 Dec 2017 11:04:41 +1300
Subject: [PATCH] docs: clarify the use of classes and interfaces in style
 guide (#20919)

PR Close #20919
---
 aio/content/guide/styleguide.md | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/aio/content/guide/styleguide.md b/aio/content/guide/styleguide.md
index e6eb49e3e1..c73cebe4dc 100644
--- a/aio/content/guide/styleguide.md
+++ b/aio/content/guide/styleguide.md
@@ -1904,7 +1904,18 @@ It is rarely worth the effort to change them at the risk of breaking existing co
 
 
 
-**Consider** using a class instead of an interface.
+**Consider** using a class instead of an interface for services and declarables (components, directives, and pipes).
+
+
+</div>
+
+
+
+<div class="s-rule consider">
+
+
+
+**Consider** using an interface for data models.
 
 
 </div>