diff --git a/user/cat.c b/user/cat.c
index f9f86b5b220a93cf6c79a24fe1ac9909ddabacfd..3115cb8d796f945dbda0837b62cd525ffd3a9426 100755
--- a/user/cat.c
+++ b/user/cat.c
@@ -1,7 +1,7 @@
 #include "kernel/include/types.h"
 #include "kernel/include/stat.h"
 #include "xv6-user/user.h"
-
+//456
 char buf[512];
 
 void