diff --git a/xCAT-client/pods/man1/getmacs.1.pod b/xCAT-client/pods/man1/getmacs.1.pod
index 61bee660d..f4f41895e 100644
--- a/xCAT-client/pods/man1/getmacs.1.pod
+++ b/xCAT-client/pods/man1/getmacs.1.pod
@@ -18,7 +18,7 @@ B<getmacs> I<noderange> [B<-V>| B<--verbose>] [B<-f>] [B<-d>] [B<--arp>] | [B<-D
 
 =head2 blade specific:
 
-B<getmacs> I<noderange> [B<-V>| B<--verbose>] [B<-d>] [B<--arp>]
+B<getmacs> I<noderange> [B<-V>| B<--verbose>] [B<-d>] [B<--arp>] [B<-i> I<ethN>|I<enN>]
 
 =head1 DESCRIPTION
 
@@ -30,6 +30,10 @@ For PPC (without HMC, using Direct FSP Management) specific:
 
 Note: If network adapters are physically assigned to LPARs, getmacs cannot read the MAC addresses unless perform ping test, since there is no HMC command to read them and getmacs has to login to open formware. And if the LPARs has never been activated before, getmacs need to be performed with the option "B<-D>" to get theirs MAC addresses.
 
+For IBM Flex Compute Node (Compute Node for short) specific:
+
+Note: If "B<-d>" is specified, all the MAC of the blades will be displayed. If no option specified, the first MAC address of the blade will be written to mac table.
+
 =head1 OPTIONS
 
 B<--arp>          
@@ -84,6 +88,10 @@ B<-V>
 
 Verbose output.
 
+B<-i>
+
+Specify the interface whose mac address will be collected and written into mac table. If 4 mac addresses are returned by option '-d', they all are the mac addresses of the blade. The N can start from 0(map to the eth0 of the blade) to 3. If 5 mac addresses are returned, the 1st mac address must be the mac address of the blade's FSP, so the N will start from 1(map to the eth0 of the blade) to 4. 
+
 
 =head1 RETURN VALUE