diff --git a/app/Main.hs b/app/Main.hs
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -30,6 +30,7 @@
 import Control.Applicative
 import qualified Data.Text as T
 import qualified Data.Map.Lazy as M
+import Data.Monoid
 import Data.Array.IArray
 import Data.Maybe
 import Data.FileEmbed
diff --git a/maxent-learner-hw.cabal b/maxent-learner-hw.cabal
--- a/maxent-learner-hw.cabal
+++ b/maxent-learner-hw.cabal
@@ -1,5 +1,5 @@
 name:                maxent-learner-hw
-version:             0.1.0
+version:             0.1.1
 synopsis:            Hayes and Wilson's maxent learning algorithm for phonotactic grammars.
 description:         Provides an implementation of Hayes and Wilson's machine learning algorithm for maxent phonotactic grammars, as both a command-line tool and a function library.  The learner takes in a lexicon and produces a list of weighted constraints penalizing certain sound sequemces in an attempt to produce a probability distribution of words which maximizes the probability of the lexicon. Once such a set of constraints is generated, it can be tested by using it to generate random pronounceable text.
                      .