diff --git a/generic-trie.cabal b/generic-trie.cabal
--- a/generic-trie.cabal
+++ b/generic-trie.cabal
@@ -1,5 +1,5 @@
 name:                generic-trie
-version:             0.3
+version:             0.3.0.1
 synopsis:            A map, where the keys may be complex structured data.
 description:         This type implements maps where the keys are themselves
                      complex structured data.  For example, the keys may be
diff --git a/src/Data/GenericTrie.hs b/src/Data/GenericTrie.hs
--- a/src/Data/GenericTrie.hs
+++ b/src/Data/GenericTrie.hs
@@ -52,6 +52,7 @@
   , member
   , notMember
   , null
+  , lookup
 
   -- ** Folding
   , foldWithKey