diff --git a/lib/hash_syntax/runner.rb b/lib/hash_syntax/runner.rb
index 2ac9ca9..ac44635 100644
--- a/lib/hash_syntax/runner.rb
+++ b/lib/hash_syntax/runner.rb
@@ -34,10 +34,10 @@ def validate_options(opts)
     
     def gather_files
       if ARGV.empty?
-        AUTO_SUBDIRS.map { |dir| Dir["#{Dir.pwd}/#{dir}/**/*.rb"] }.flatten
+        AUTO_SUBDIRS.map { |dir| Dir["#{Dir.pwd}/#{dir}/**/*.{rb,html.haml}"] }.flatten
       else
         ARGV
       end
     end
   end
-end
\ No newline at end of file
+end