diff --git a/obfssh_client/README.md b/obfssh_client/README.md
index d584642..95d7d5e 100644
--- a/obfssh_client/README.md
+++ b/obfssh_client/README.md
@@ -15,7 +15,7 @@ run server
 
     vim config.yaml
 
-    ssh-keygen -f ssh_host_rsa_key -t rsa 1024
+    ssh-keygen -f ssh_host_rsa_key -t rsa
 
     $GOPATH/bin/obfssh_server -c config.yaml
 
diff --git a/obfssh_server/README.md b/obfssh_server/README.md
index acbb9b8..bdbdcb7 100644
--- a/obfssh_server/README.md
+++ b/obfssh_server/README.md
@@ -15,7 +15,7 @@ run server
 
     vim config.yaml
 
-    ssh-keygen -f ssh_host_rsa_key -t rsa 1024
+    ssh-keygen -f ssh_host_rsa_key -t rsa
 
     $GOPATH/bin/obfssh_server -c config.yaml