diff --git a/lib/rb/benchmark/Benchmark.thrift b/lib/rb/benchmark/Benchmark.thrift
new file mode 100644
index 0000000..d0494cc
--- /dev/null
+++ b/lib/rb/benchmark/Benchmark.thrift
@@ -0,0 +1,5 @@
+namespace rb ThriftBenchmark
+
+service BenchmarkService {
+  i32 fibonacci(1:byte n)
+}