diff --git a/xCAT-client/pods/man1/lsslp.1.pod b/xCAT-client/pods/man1/lsslp.1.pod
index 344abdb64..793fa67f3 100644
--- a/xCAT-client/pods/man1/lsslp.1.pod
+++ b/xCAT-client/pods/man1/lsslp.1.pod
@@ -36,6 +36,13 @@ B<-h>          Display usage message.
 
 B<-n>          Only display and write the newly discovered hardwares.
 
+B<-u>          Do unicast to a specified IP range. Must be used with -s and --range.
+
+B<--range>     Specify one or more IP ranges. Must be use in unicast mode. 
+            It accepts multiple formats. For example, 192.168.1.1/24, 40-41.1-2.3-4.1-100.
+            If the range is huge, for example, 192.168.1.1/8, lsslp may take a very long time for node scan.
+            So the reange should be exactly specified. 
+
 B<-r>          Display Raw SLP response.
 
 B<-C>          The number of the expected responses specified by the user. 
@@ -277,6 +284,9 @@ e114ngmm1:
         otherinterfaces=70.0.0.30
         hwtype=cmm
 
+10. To use lsslp unicast, enter:
+    lsslp -u -s CEC --range 40-41.1-2.1-2.1-2
+
 =head1 FILES
 
 /opt/xcat/bin/lsslp