diff --git a/Data/Map/Ordered/Strict.hs b/Data/Map/Ordered/Strict.hs
index 0896869..0c1deeb 100644
--- a/Data/Map/Ordered/Strict.hs
+++ b/Data/Map/Ordered/Strict.hs
@@ -23,6 +23,7 @@ module Data.Map.Ordered.Strict
 	-- * Deletion
 	, delete, filter, (\\)
 	, (|/\), (/\|), intersectionWith
+        , alter
 	-- * Query
 	, null, size, member, notMember, lookup
 	-- * Indexing