diff --git a/docs/css/margin-left.md b/docs/css/margin-left.md
index 9e73e48371408ee1b8b395240a99d59e8b770c6c..2441db14daff2370391c9e1a4d57258d4d836034 100644
--- a/docs/css/margin-left.md
+++ b/docs/css/margin-left.md
@@ -11,7 +11,8 @@
 
 <!-- CSSJSON.margin-left.unixTags -->
 
-**注意**  
+**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-left.compatibility -->