diff --git a/README.md b/README.md
index e6541b3..181b5f5 100644
--- a/README.md
+++ b/README.md
@@ -60,3 +60,7 @@ And in future i will make it to support more flexible grammar.
 # Calculator
 
 You can try a calculator in version 0.17~0.19 !
+
+# Abstract syntax tree
+
+In version 1.0 the ast will be completed.