diff --git a/shell/index.md b/shell/index.md
index 7b1f439..7a8fd6a 100644
--- a/shell/index.md
+++ b/shell/index.md
@@ -62,7 +62,7 @@ $ date -d “now” %Y-%m-%d
 //取昨天時間  
 $ date -d “yesterday” %Y-%m-%d  
 $ date -d “1 days ago” %Y-%m-%d  
-## -d, –date=STRING         display time described by STRING, not `now’  
+//-d, –date=STRING         display time described by STRING, not `now’  
 STRING可以為‘now’ 、 ‘yesterday’、 ‘n days ago’  
 ‘n days ago’  表示n天前的那一天