diff --git a/README.md b/README.md
index 34e2d2b2..1971ad81 100644
--- a/README.md
+++ b/README.md
@@ -31,3 +31,5 @@ In order to execute code submissions using Docker, source code files are written
 
 - create production configuration files (*database.production.yml*, …)
 - customize *config/deploy/production.rb* if you want to deploy using [Capistrano](http://capistranorb.com/)
+
+The application is compatible with MRI and JRuby. Due to superior parallelism, we recommend using JRuby.