--- a/README.md	Sat Oct 21 19:12:11 2017 +0200
+++ b/README.md	Sat Oct 21 19:17:07 2017 +0200
@@ -11,6 +11,11 @@
 
 ## Installation
 
+Please note that Mastodon 2.0.0 has a breaking API change (see issue #9).
+
+`madonctl` v2.0.0+ is required for Mastodon 2.0.0+ server, but the new version
+will not work with old servers.
+
 ### From source
 
 To install the application from source (you need to have Go >= 1.7), just type: