diff --git a/README.md b/README.md
index fd3ccfd058f79afc733fe13ecce768b08b212be4..775282f1434c9628ee5f14368000bfab9f713657 100644
--- a/README.md
+++ b/README.md
@@ -127,6 +127,8 @@ On the `pg_hba.conf` file add a line like that at the end:
 host    all             all             <the netmask you want to add>            scram-sha-256
 ```
 
+The netmask should look like `A.B.C.D/E` like `0.0.0.0/0` for everyone, for example.
+
 Also change the `listen_addresses` instruction to `'*'` in `postgresql.conf`.
 
 ## Install Nginx