diff --git a/README.md b/README.md
index 2ff8356..e6541b3 100644
--- a/README.md
+++ b/README.md
@@ -56,3 +56,7 @@ But something occurred,so i finally didn't make it.However you can still see thi
 The parser can recognize some basic elements in resource program.
 
 And in future i will make it to support more flexible grammar.
+
+# Calculator
+
+You can try a calculator in version 0.17~0.19 !