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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ The .gem can be found here: https://rubygems.org/gems/nlp_ruby
          bleu.rb : BLEU implementation, also per-sentence-BLEU
           dag.rb : implementation of a directed acyclic graph and various algorithms
      fileutil.rb : file utilities
+      grammar.rb : classes to model grammars (mostly for translation grammars)
            hg.rb : data structures and algorithms (viterbi currently) for hypergraphs
          misc.rb : misc. stuff (e.g. monkey patches for Array and String)
     semirings.rb : semirings (used in dags.rb)