diff --git a/README.md b/README.md
index c2d7751..c677a43 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,12 @@
 # Very-Simple-Java-Calculator
 For beginners 4 operations without exceptions and while loop.
-Basic
+
+Enter following commands in your terminal to clone this project and make contributions:
+
+```sh
+$ git clone https://github.com/weibeu/Very-Simple-Java-Calculator.git
+$ cd Very-Simple-Java-Calculator
+# Make some changes.
+$ git commit -m "My new feature."
+$ git push
+```