diff --git a/docs/ikev2-howto-zh.md b/docs/ikev2-howto-zh.md
index df274e9..bf1164d 100644
--- a/docs/ikev2-howto-zh.md
+++ b/docs/ikev2-howto-zh.md
@@ -92,7 +92,7 @@ Options:
   --addclient [client name]     add a new client using default options
   --exportclient [client name]  export configuration for an existing client
   --listclients                 list the names of existing clients
-  --revokeclient                revoke a client certificate
+  --revokeclient [client name]  revoke a client certificate
   --removeikev2                 remove IKEv2 and delete all certificates and keys from the IPsec database
   -h, --help                    show this help message and exit
 
diff --git a/docs/ikev2-howto.md b/docs/ikev2-howto.md
index 80c783d..4f704ee 100644
--- a/docs/ikev2-howto.md
+++ b/docs/ikev2-howto.md
@@ -92,7 +92,7 @@ Options:
   --addclient [client name]     add a new client using default options
   --exportclient [client name]  export configuration for an existing client
   --listclients                 list the names of existing clients
-  --revokeclient                revoke a client certificate
+  --revokeclient [client name]  revoke a client certificate
   --removeikev2                 remove IKEv2 and delete all certificates and keys from the IPsec database
   -h, --help                    show this help message and exit