diff --git a/Database/MongoDB.hs b/Database/MongoDB.hs
index 6049887..a472e0f 100644
--- a/Database/MongoDB.hs
+++ b/Database/MongoDB.hs
@@ -36,7 +36,7 @@ module Database.MongoDB
      ColCreateOpt(..),
      collectionNames, createCollection, dropCollection,
      renameCollection, runCommand, validateCollection,
-     authenticate, login, addUser,
+     auth, addUser, login, logout,
      -- * Collection
      Collection, FieldSelector, FullCollection,
      NumToSkip, NumToReturn, Selector,
@@ -564,8 +564,12 @@ login c db user pass = do
                            ("key", toBson digest)]
       in runCommand c db request
 
-authenticate :: Connection -> Database -> Username -> Password -> IO BsonDoc
-authenticate = login
+auth :: Connection -> Database -> Username -> Password -> IO BsonDoc
+auth = login
+
+logout :: Connection -> Database -> IO ()
+logout c db =
+    runCommand c db (toBsonDoc [(s2L "logout", BsonInt32 1)]) >> return ()
 
 -- | create a new user in the current /Database/
 addUser :: Connection -> Database -> Username -> Password -> IO BsonDoc
diff --git a/TODO b/TODO
index a28f0b2..0a6baf5 100644
--- a/TODO
+++ b/TODO
@@ -29,7 +29,6 @@ MongoDB
     * last_status
     * logout
     * reset_error_history
-    * eval
   - database admin
     * getAdmin
     * getProfilingLevel