diff --git a/experiments/tree-sitter-test/grammar.js b/experiments/tree-sitter-test/grammar.js
index f86112b..0af49df 100644
--- a/experiments/tree-sitter-test/grammar.js
+++ b/experiments/tree-sitter-test/grammar.js
@@ -1,6 +1,14 @@
 module.exports = grammar({
     name: "TestLang",
     rules: {
-        source_file: $ => "hello"
+        source_file: $ => repeat($._definition),
+
+        _definition: $ => choice(
+            $.function_definition
+            //TODO others
+        )
+
+
+
     }
 });