diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..ceaf18a
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1 @@
+FROM ubuntu
diff --git a/README.md b/README.md
index f9ab523..a8c76dd 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Modern Compiler Implementation in C++
 [![CMake](https://github.com/JasonNFS/Modern-Compiler-Implementation-in-cpp/actions/workflows/cmake.yml/badge.svg)](https://github.com/JasonNFS/Modern-Compiler-Implementation-in-cpp/actions/workflows/cmake.yml)
 
-This is a c++ 17/20 implementation of book 
+This is a c++ 17/20 implementation of book (testting)
 [Modern Compiler Implementation in C](https://www.cs.princeton.edu/~appel/modern/c/).
 Still in working, any question or suggestion are welcome :)