diff --git a/mantisbt/README.md b/mantisbt/README.md
index 81b8e7e..6b38f5d 100644
--- a/mantisbt/README.md
+++ b/mantisbt/README.md
@@ -17,10 +17,12 @@ mysql:
   environment:
     - MYSQL_ROOT_PASSWORD=root
     - MYSQL_DATABASE=bugtracker
+    - MYSQL_USER=mantisbt
+    - MYSQL_PASSWORD=mantisbt
   restart: always
 ```
 
-> You can use `mariadb` instead of `mysql`.
+> You can use `mariadb`/`postgres` instead of `mysql`.
 
 ## setup
 
@@ -36,8 +38,8 @@ Installation Options
 ==================================================================================
 Type of Database                                        MySQL/MySQLi
 Hostname (for Database Server)                          mysql
-Username (for Database)                                 root
-Password (for Database)                                 root
+Username (for Database)                                 mantisbt
+Password (for Database)                                 mantisbt
 Database name (for Database)                            bugtracker
 Admin Username (to create Database if required)         root
 Admin Password (to create Database if required)         root
diff --git a/mantisbt/docker-compose.yml b/mantisbt/docker-compose.yml
index d5ba743..bbc5122 100644
--- a/mantisbt/docker-compose.yml
+++ b/mantisbt/docker-compose.yml
@@ -11,4 +11,13 @@ mysql:
   environment:
     - MYSQL_ROOT_PASSWORD=root
     - MYSQL_DATABASE=bugtracker
+    - MYSQL_USER=mantis
+    - MYSQL_PASSWORD=mantis
+  restart: always
+
+postgres:
+  image: postgres:latest
+  environment:
+    - POSTGRES_USER=root
+    - POSTGRES_PASSWORD=root
   restart: always