diff --git a/dirs b/ds
similarity index 86%
rename from dirs
rename to ds
index ddc4053..3e5f58a 100755
--- a/dirs
+++ b/ds
@@ -1,6 +1,6 @@
 #!/usr/bin/perl
 
-# dirs - calculate and display the size of a given directory in a human readable format
+# ds - calculate and display the size of a given directory in a human readable format
 # Copyright Frederick Boniface 2023 - fredboniface.co.uk
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -25,8 +25,13 @@ use strict;
 use warnings;
 use File::Find;
 
-if (@ARGV != 1) {
-    die "Usage: $0 <directory_path>\n"
+if (@ARGV == 0) {
+    print <<EOF;
+\nUsage: $0 <directory_path>
+
+Calculate the size of a directory and its contents.\n
+EOF
+    exit;
 }
 
 my $dir_path = $ARGV[0];
@@ -36,7 +41,7 @@ unless (-d $dir_path) {
 }
 
 if ($dir_path eq '/') {
-    die "You are not able to run 'dirs' on the root directory\n"
+    die "You are not able to run 'ds' on the root directory\n"
 }
 
 my $total_size = 0;