diff --git a/src/ameba/source.cr b/src/ameba/source.cr
index 25c14f9c..3fd8d751 100644
--- a/src/ameba/source.cr
+++ b/src/ameba/source.cr
@@ -52,6 +52,7 @@ module Ameba
     def ast
       @ast ||=
         Crystal::Parser.new(code)
+          .tap { |parser| parser.wants_doc = true }
           .tap { |parser| parser.filename = @path }
           .parse
     end