diff --git a/doc/postgres-create-user.md b/doc/postgres-create-user.md
index 6dc47c2..6b8a81b 100644
--- a/doc/postgres-create-user.md
+++ b/doc/postgres-create-user.md
@@ -5,6 +5,11 @@
 CREATE USER <user name> with encrypted password 'key';
 ```
 
+* create a `SUPERUSER` user called `user name` with password `key`
+```
+CREATE USER SUPERUSER <user name> with encrypted password 'key';
+```
+
 * OPTION: gant user `user name` access to database `database name`
 ```
 GRANT ALL PRIVILEGES ON DATABASE <database name> TO <user name>;