diff --git a/README.md b/README.md
index 802b46f..4c81fee 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,10 @@ An Ansible playbook to install Mastodon
 
 ## Instructions for running this playbook
 
+- Copy group_vars/all.sample to group_vars/all and edit it to specify the
+  database name you wish to use with Mastodon. **The PostgreSQL database role
+  will drop this database in preparation for Mastodon's database setup so make
+  sure this is not a database you are currently using**
 - Copy roles/mastodon-config/templates/.env.production.sample to
   roles/mastodon-config/templates/.env.production, edit with all
   relevant details. (SMTP details are probably the only required one,