diff --git a/doc/ast_structure.txt b/doc/ast_structure.txt
new file mode 100644
index 0000000..77fca33
--- /dev/null
+++ b/doc/ast_structure.txt
@@ -0,0 +1,6 @@
+lib:
+    class:
+        vars
+        funcs:
+            vars
+            commands
\ No newline at end of file