diff --git a/grammar.js b/grammar.js
index d8ea699..486fe93 100644
--- a/grammar.js
+++ b/grammar.js
@@ -33,6 +33,7 @@ module.exports = grammar({
     // Expressions {{{
 
     _expr: ($) => choice(
+      // Literals
       $.identifier,
       $.integer_literal,
       $._string_literal,