diff --git a/xCAT-client/pods/man1/getmacs.1.pod b/xCAT-client/pods/man1/getmacs.1.pod
index 7e3c47db3..3921e6c0f 100644
--- a/xCAT-client/pods/man1/getmacs.1.pod
+++ b/xCAT-client/pods/man1/getmacs.1.pod
@@ -50,7 +50,7 @@ Perform ping test.  Please be aware that in this way, the lpars will be reset.
 
 B<-f>          
 
-Force immediate shutdown of the partition.
+Force immediate shutdown of the partition.This flag must be used with -D flag.
 
 B<-F>