diff --git a/2025.04.13_custom_linux_command/simple_command.sh b/2025.04.13_custom_linux_command/simple_command.sh
index f127e7b..3f53042 100644
--- a/2025.04.13_custom_linux_command/simple_command.sh
+++ b/2025.04.13_custom_linux_command/simple_command.sh
@@ -1,3 +1,5 @@
+alias l="ls"
+
 alias q="qstat"
 
 alias qn="qstat -n"