diff --git a/xCAT-client/pods/man1/monshow.1.pod b/xCAT-client/pods/man1/monshow.1.pod
index 7f498b085..7ea0c7562 100755
--- a/xCAT-client/pods/man1/monshow.1.pod
+++ b/xCAT-client/pods/man1/monshow.1.pod
@@ -10,7 +10,7 @@ I<monshow [-h| --help]>
 
 I<monshow [-v| --version]>
 
-I<monshow name [noderange] [-s] [-t time] [-a attributes] [-o pe]>
+I<monshow name [noderange] [-s] [-t time] [-a attributes] [-w attr<operator>val [-w attr<operator>val] ... ][-o {p|e}]>
 
 
 
@@ -38,7 +38,20 @@ B<-t>	specifies a range of time for the data, The default is last 60 minutes. Fo
 
 B<-a>	specifies a comma-separated list of attributes or metrics names. The default is all. 
 
-B<-o>	specifies montype, it can be p, e or pe. p means performance, e means events, not used now.
+B<-w>	specify one or multiple selection string that can be used to select events. The operators ==, !=, =,!,>,<,>=,<= are available.  Wildcards % and _ are supported in the pattern string. % allows you to match any string of any length(including zero length) and _ allows you to match on a single character. The valid attributes are eventtype, monitor, monnode, application, component, id, serverity, message, rawdata, comments. Valid severity are: Informational, Warning, Critical.
+
+Operator descriptions: 
+  ==        Select event where the attribute value is exactly this value.
+  !=        Select event where the attribute value is not this specific value.
+  =~        Select event where the attribute value matches this pattern string. Not work with severity.
+  !~        Select event where the attribute value does not match this pattern string. Not work with severity.
+  >         Select event where the severity is higher than this value. Only work with severity.
+  <         Select event where the severity is lower than this value. Only work with severity.
+  >=        Select event where the severity is higher than this value(include). Only work with severity.
+  <=        Select event where the severity is lower than this value(include). Only work with severity.
+            Note: if the "val" or "operator" fields includes spaces or any other characters that will be parsed by shell, the "attr<operator>val" needs to be quoted. If the operator is "!~", the "attr<operator>val" needs to be quoted using single quote.
+
+B<-o>	specifies montype, it can be p or e. p means performance, e means events.
 
 
 =head1 RETURN VALUE
@@ -61,6 +74,10 @@ B<-o>	specifies montype, it can be p, e or pe. p means performance, e means even
 
   monshow rmcmon servicenode1 -s
 
+4. To show RMC event with severity Critical, enter:
+
+  monshow rmcmon -w severity==Critical
+
 
 =head1 FILES