diff --git a/docs/css/margin-bottom.md b/docs/css/margin-bottom.md
index 9436e0a0d5650e65d76a20660961d84b9bf9b214..627e9ebe03752e7efac9a99e84a3b580f935f87a 100644
--- a/docs/css/margin-bottom.md
+++ b/docs/css/margin-bottom.md
@@ -12,6 +12,7 @@
 <!-- CSSJSON.margin-bottom.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-bottom.compatibility -->