diff --git a/xCAT-client/pods/man1/rvitals.1.pod b/xCAT-client/pods/man1/rvitals.1.pod
index c34a42b6b..3bce77fa8 100644
--- a/xCAT-client/pods/man1/rvitals.1.pod
+++ b/xCAT-client/pods/man1/rvitals.1.pod
@@ -82,12 +82,14 @@ Retrieves power status.
 =item B<powertime>
 
 Retrieves total power uptime.  This value only increases, unless
-the Service Processor flash gets updated.
+the Service Processor flash gets updated.  This option is not valid
+for x86 architecture systems.
 
 =item B<reboot>
 
 Retrieves  total  number of reboots.  This value only increases,
-unless the Service Processor flash gets updated.
+unless the Service Processor flash gets updated.  This option
+is not valid for x86 architecture systems.
 
 =item B<state>