diff --git a/README.md b/README.md
index 6f6e637..5a1624a 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,11 @@ This requirements are specified with their common names, **adapt the package nam
 - php-pqsql (Postgres)
 - php-curl (Curl)
 
+### Custom guides
+
+Mastodon:
+- When **configuring the instance** after you've added it (on #instance_config view), there is a field called "API authkey", which is the API key created on your Mastodon instance, with your admin account, and must have all `admin:*` privileges set. See **how to create API keys** in your instance URL `/settings/applications/new`
+
 ## About Versioning
 
 All tags are created from a moment of the "main" branch. There can be alpha- or beta- prefixes to a version, but all prefixes have there own numeration.