diff --git a/perl-xCAT/xCAT/Usage.pm b/perl-xCAT/xCAT/Usage.pm
index c373207e9..4597f15ad 100644
--- a/perl-xCAT/xCAT/Usage.pm
+++ b/perl-xCAT/xCAT/Usage.pm
@@ -327,7 +327,7 @@ my %usage = (
     or
     updatenode <noderange> [-V|--verbose] [-k|--security] [-s|--sn]
     or
-    updatenode <noderange> [-V|--verbose] [-F|--sync | -f|--snsync] [-S|--sw] 
+    updatenode <noderange> [-V|--verbose] [-F|--sync | -f|--snsync] [-l|--user[username]] [-S|--sw] 
         [-P|--scripts [script1,script2,...]] [-s|--sn] 
         [-A|--updateallsw] [-c|--cmdlineonly] [-d alt_source_dir]
         [attr=val [attr=val...]]
@@ -344,6 +344,8 @@ Options:
 
     [-f|--snsync] Performs File Syncing to the service nodes that service 
         the nodes in the noderange.
+    [-l|--user] User name to run the updatenode command.  It overrides the
+        current user which is the default.
 
     [-S|--sw] Perform Software Maintenance.