diff --git a/content/2.getting-started/2.installation.md b/content/2.getting-started/2.installation.md
index 1adc920..d99f588 100644
--- a/content/2.getting-started/2.installation.md
+++ b/content/2.getting-started/2.installation.md
@@ -38,6 +38,19 @@ postal initialize
 postal make-user
 ```
 
+### Non-interactive admin user creation
+
+`postal make-user` is interactive by default. For automated or unattended setups (e.g. CI, docker-compose init scripts), you can run it non-interactively by setting all four of these environment variables before invoking the command:
+
+```bash
+POSTAL_INITIAL_USER_EMAIL=admin@example.com
+POSTAL_INITIAL_USER_FIRST_NAME=Admin
+POSTAL_INITIAL_USER_LAST_NAME=User
+POSTAL_INITIAL_USER_PASSWORD=...
+```
+
+In this mode, `make-user` upserts by e-mail address: it creates a new user if no record with that e-mail exists, or updates the first name, last name, and password of the existing record otherwise. The command is safe to re-run on subsequent boots.
+
 ## Running postal
 
 You're now ready to actually run Postal itself. You can go ahead and do this by running: