diff --git a/docs/css/margin-right.md b/docs/css/margin-right.md
index 48595820644021bbd021a6c0c41b43c4a5b737f6..c60a2fb88173a6d4f41db9b55c91c7402379c520 100644
--- a/docs/css/margin-right.md
+++ b/docs/css/margin-right.md
@@ -12,6 +12,7 @@
 <!-- CSSJSON.margin-right.unixTags -->
 
 **注意**  
+app端不支持外边距折叠
 3.98以下版本当position:fixed|absolute时,margin不支持auto
 
 <!-- CSSJSON.margin-right.compatibility -->