diff --git a/lib/custom.php b/lib/custom.php
index a1ee51d..b957a16 100644
--- a/lib/custom.php
+++ b/lib/custom.php
@@ -32,7 +32,7 @@ public static function help(): string
 
 Default commands
 -------
-help, cd, chown, date, df, echo, ffmpeg, find, free, git, grep, hostname, ls, tail, php, pwd, whoami
+help, cd, chown, date, df, echo, ffmpeg, find, free, git, grep, hostname, ls, tail, php, ping, pwd, whoami
 
 Special REDAXO commands
 -------