diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..03bf80b
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,6 @@
+# Copy to .env (untracked). Contains no secrets.
+# Verified as existing Docker Hub tags on 2026-10-12; re-check before deploying.
+GITEA_VERSION=1.27.3
+CADDY_VERSION=2.11.7
+# Your student-domain hostname once claimed, e.g. git.yourname.me
+GITEA_DOMAIN=git.example.com