diff --git a/exe/mm2ep-depend b/exe/mm2ep-depend
index 40114fe..8c3f533 100755
--- a/exe/mm2ep-depend
+++ b/exe/mm2ep-depend
@@ -28,9 +28,10 @@ module Mm2ep
         pp token
         puts "RAW : #{line}"
         puts "EVAL: #{token.to_s}"
+
         parser.check_grammar line, token
-        binding.pry
         exit 1 unless token.errors.empty? || token.nil?
+        
         puts "RESULT: #{token.compute}"
 
       end
diff --git a/lib/mm2ep_depend/parser.rb b/lib/mm2ep_depend/parser.rb
index 2329b1d..bd9c4d8 100755
--- a/lib/mm2ep_depend/parser.rb
+++ b/lib/mm2ep_depend/parser.rb
@@ -176,6 +176,7 @@ module Mm2ep
     class Parser < Rly::Yacc
       attr_writer :names
 
+      # Check if grammar is valid
       def check_grammar(line, tokens)
         grammar = tokens.to_s.split(/=|AND|OR/)
         expr = line.split(/=|AND|OR/)