diff --git a/Data-Structrue/2-stack-ex.md b/Data-Structrue/2-stack-ex.md
index b5a530c..0418fc4 100644
--- a/Data-Structrue/2-stack-ex.md
+++ b/Data-Structrue/2-stack-ex.md
@@ -106,7 +106,7 @@ $C./+(*-*$
 
 $D./＋-*$
 
-解：$B$。
+解：$B$。将#作为初始值。
 
 ![table2]