diff --git a/TODO.md b/TODO.md
index bddb51a..f9d9872 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,3 +1,5 @@
+also generate exp from grammar
+- exp might represent movement 
 copy old examples from partech (without let)
 note about grammar function (take a grammar return a grammar)
 rename lang1 to lang