diff --git a/compose/.env.example b/compose/.env.example
index 6942e7b..7574d10 100644
--- a/compose/.env.example
+++ b/compose/.env.example
@@ -6,6 +6,7 @@
 # Please refer to our documentation to see all possible variables:
 #   https://www.openproject.org/docs/installation-and-operations/configuration/environment/
 #
+TAG=12
 HTTPS=false
 OPENPROJECT_HOST__NAME=localhost
 PORT=127.0.0.1:8080
@@ -14,3 +15,5 @@ IMAP_ENABLED=false
 DATABASE_URL=postgres://postgres:p4ssw0rd@db/openproject?pool=20&encoding=unicode&reconnect=true
 RAILS_MIN_THREADS=4
 RAILS_MAX_THREADS=16
+PGDATA="/var/lib/postgresql/data"
+OPDATA="/var/openproject/assets"