diff --git a/xCAT-server/lib/xcat/plugins/NTPsn.pm b/xCAT-server/lib/xcat/plugins/NTPsn.pm
index 6e5abf15c..79ad3ce95 100644
--- a/xCAT-server/lib/xcat/plugins/NTPsn.pm
+++ b/xCAT-server/lib/xcat/plugins/NTPsn.pm
@@ -10,7 +10,7 @@ use File::Path;
 #-------------------------------------------------------
 
 =head1 
-  xCAT plugin package to setup NTP on a  service node 
+  xCAT plugin package to setup NTP on a  Linux service node 
 
 
 #-------------------------------------------------------