diff --git a/docs/css/margin-top.md b/docs/css/margin-top.md
index 61738edc4910ff26be1328e50ce5235fe14c3655..e2d90d5f25f1dc9feea6d98f46226974c6ba60ab 100644
--- a/docs/css/margin-top.md
+++ b/docs/css/margin-top.md
@@ -12,6 +12,7 @@
 <!-- CSSJSON.margin-top.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-top.compatibility -->