diff --git a/lib/rb/spec/ThriftSpec.thrift b/lib/rb/spec/ThriftSpec.thrift
index 101caff..1012e51 100644
--- a/lib/rb/spec/ThriftSpec.thrift
+++ b/lib/rb/spec/ThriftSpec.thrift
@@ -16,3 +16,11 @@
 struct BoolStruct {
   1: bool yesno = 1
 }
+
+service NonblockingService {
+  Hello greeting(1:bool english)
+  bool block()
+  async void unblock()
+  async void shutdown()
+  void sleep(1:double seconds)
+}