diff --git a/server_simple.rb b/server_simple.rb
index fa8e425..084e431 100644
--- a/server_simple.rb
+++ b/server_simple.rb
@@ -11,4 +11,7 @@
 trap 'INT' do server.shutdown end
 
 ## Start the server
+server.mount_proc '/' do |req, res|
+    res.body = 'Hello, world!'
+end
 server.start
\ No newline at end of file