diff --git a/CMakeLists.txt b/CMakeLists.txt
index 660c7f2..d96eca2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ project(mrubypp LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-option(MRUBYPP_BUILD_TEST "Build Catch2 Test" ON)
+option(MRUBYPP_BUILD_TEST "Build Catch2 Test" OFF)
 
 if (MSVC)
     add_compile_options("$<$<C_COMPILER_ID:MSVC>:/utf-8>")
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9e8e853
--- /dev/null
+++ b/README.md
@@ -0,0 +1,25 @@
+# mrubypp
+
+mruby c++ header only library
+
+## Installation
+- install mruby
+- add to cmake project, link `mrubypp` or copy *.h to you projects
+- `cmake -DMRUBYPP_BUILD_TEST=ON .` build tests
+
+## Usage
+```
+  #include "mrubypp.h"
+
+  mrubypp engine;
+  engine.load(R"(
+      def sort_and_get_first(a)
+        a.sort!
+        a[0]
+      end
+  )");
+
+  std::vector<int> a{3, 1, 2};
+  auto b = engine.call<int>("sort_and_get_first", a);
+  assert(b == 1);
+```
\ No newline at end of file
diff --git a/test/test_engine.cpp b/test/test_engine.cpp
index a9ca097..6d71bd0 100644
--- a/test/test_engine.cpp
+++ b/test/test_engine.cpp
@@ -24,14 +24,14 @@ TEST_CASE("none args call", "[engine]") {
 TEST_CASE("args call", "[engine]") {
   mrubypp engine;
   engine.load(R"(
-      def add(a)
+      def sort_and_get_first(a)
         a.sort!
         a[0]
       end
   )");
 
   std::vector<int> a{3, 1, 2};
-  auto b = engine.call<int>("add", a);
+  auto b = engine.call<int>("sort_and_get_first", a);
   REQUIRE(b == 1);
 }