diff --git a/readme.md b/readme.md
index f90f70f..deecc27 100644
--- a/readme.md
+++ b/readme.md
@@ -127,7 +127,7 @@ The required schema in the database is
 	    topic VARCHAR(256) NOT NULL,
 	    rw INTEGER(1) NOT NULL DEFAULT 1,	-- 1 is read, 2 is write, 3 is readwrite, 4 is subscribe
 	    PRIMARY KEY (id),
-	    CONSTRAINT `fk_book_author`
+	    CONSTRAINT `fk_users_user`
 	      FOREIGN KEY (user) REFERENCES users_t (id)
 	      ON DELETE CASCADE
 	      ON UPDATE CASCADE
@@ -145,6 +145,10 @@ The password is generated using the `pw` tool provided by mosquitto-go-auth, whi
 
 For further information consult the readme and the examples in the mosquitto-go-auth project (https://github.com/iegomez/mosquitto-go-auth or https://github.com/wollud1969/mosquitto-go-auth).
 
+For MariaDB and PostgreSQL there are prepared table create statements in the repository,
+
+For PostgresSQL there is a prepared Python tool in the directory `tools` available to added users into the database.
+
 
 ## Preparing configuration and certificates
 
diff --git a/tools/genpw.py b/tools/genpw.py
index 42df04c..b840251 100755
--- a/tools/genpw.py
+++ b/tools/genpw.py
@@ -5,15 +5,26 @@ from base64 import b64encode
 import argparse
 import secrets
 import string
+import psycopg2
 
 
 parser = argparse.ArgumentParser(description='genpw')
 parser.add_argument('--length', '-l',
                     help='Length of auto-generated password', 
+                    default='24',
                     required=False)
 parser.add_argument('--password', '-p',
                     help='Password', 
                     required=False)
+parser.add_argument('--username', '-u',
+                    help='Username',
+                    required=True)
+parser.add_argument('--topic', '-t',
+                    help='Initially granted topic',
+                    required=True)
+parser.add_argument('--acl', '-a',
+                    help='ACL value for topic, Bit0=read, Bit1=write, Bit2=subscribe',
+                    required=True)
 
 args = parser.parse_args()
 length = args.length
@@ -32,5 +43,32 @@ hash = b64encode(PBKDF2(password, salt, iterations=iterations, digestmodule=sha5
 
 salt_b64 = b64encode(salt).decode()
 
+pw = f"PBKDF2$sha512${iterations}${salt_b64}${hash}"
 print(f"{password=}")
-print(f"PBKDF2$sha512${iterations}${salt_b64}${hash}")
+print(f"hash={pw}")
+
+
+login = args.username
+topic = args.topic
+acl = int(args.acl)
+
+conn = psycopg2.connect()
+conn.autocommit = False
+
+try:
+    with conn:
+        with conn.cursor() as cur:
+            cur.execute('insert into users_t (username, pw) values(%(username)s, %(pw)s) returning id', 
+                        { 'username': login, 'pw': pw })
+            res = cur.fetchone()
+            if res is None:
+                raise Exception("Unable to add user to database")
+            id = res[0]
+            print("User added to database")
+        with conn.cursor() as cur:
+            cur.execute('insert into acls_t ("user", topic, rw) values(%(user)s, %(topic)s, %(rw)s)',
+                        { 'user': id, 'topic': topic, 'rw': acl })
+            print("ACL added to database")
+finally:
+    if conn:
+        conn.close()
diff --git a/tools/requirements.txt b/tools/requirements.txt
index 1566a00..c495770 100644
--- a/tools/requirements.txt
+++ b/tools/requirements.txt
@@ -1 +1,2 @@
 pbkdf2==1.3
+psycopg2==2.9.5