diff --git a/postgres/README.md b/postgres/README.md
index 8db9e8c6f..152046a0c 100644
--- a/postgres/README.md
+++ b/postgres/README.md
@@ -222,7 +222,7 @@ For example, to add an additional user and database, add the following to `/dock
 #!/bin/bash
 set -e
 
-psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" <<-EOSQL
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
 	CREATE USER docker;
 	CREATE DATABASE docker;
 	GRANT ALL PRIVILEGES ON DATABASE docker TO docker;