diff --git a/Docker.md b/Docker.md
index eceaa99..9962f32 100644
--- a/Docker.md
+++ b/Docker.md
@@ -1,6 +1,8 @@
 ## Docker
 The web interface has a [GitLab CI setup](https://gitlab.com/ruany/litebans-php/-/blob/master/.gitlab-ci.yml) designed for unit testing.
 
+This CI configuration uses the latest stable versions of PHP and MariaDB. The code is kept up-to-date to be compatible with these as unit tests passing is of top priority, and deprecation warnings are treated as test failures.
+
 This GitLab CI configuration can be used to [create Docker images](https://docs.gitlab.com/ee/ci/docker/using_docker_build.html) for containerization purposes.
 
 ## Environment variables