diff --git a/crdt.cabal b/crdt.cabal
--- a/crdt.cabal
+++ b/crdt.cabal
@@ -3,14 +3,14 @@
 -- see: https://github.com/sol/hpack
 
 name:           crdt
-version:        0.4
+version:        0.5
 synopsis:       Conflict-free replicated data types
 description:    Definitions of CmRDT and CvRDT. Implementations for some classic CRDTs.
 category:       Distributed Systems
 homepage:       https://github.com/cblp/crdt#readme
 bug-reports:    https://github.com/cblp/crdt/issues
 maintainer:     Yuriy Syrovetskiy <cblp@cblp.su>
-copyright:      © 2017  Yuriy Syrovetskiy <cblp@cblp.su>, Nikolay Loginov <kemphack@mail.ru>
+copyright:      2017 Yuriy Syrovetskiy, Nikolay Loginov
 license:        BSD3
 license-file:   LICENSE
 build-type:     Simple
diff --git a/lib/CRDT/GSet/Cv.hs b/lib/CRDT/GSet/Cv.hs
--- a/lib/CRDT/GSet/Cv.hs
+++ b/lib/CRDT/GSet/Cv.hs
@@ -1,12 +1,13 @@
 module CRDT.GSet.Cv
-    ( add
+    ( GSet
+    , add
     , initial
     , query
     ) where
 
 import qualified Data.Set as Set
 
-import CRDT.GSet.Cv.Internal
+import           CRDT.GSet.Cv.Internal
 
 -- | update
 add :: Ord a => a -> GSet a -> GSet a
diff --git a/test/GSet.hs b/test/GSet.hs
--- a/test/GSet.hs
+++ b/test/GSet.hs
@@ -11,7 +11,6 @@
 import           Test.Tasty.QuickCheck (testProperty, (==>))
 
 import qualified CRDT.GSet.Cv as Cv
-import qualified CRDT.GSet.Cv.Internal as Cv
 
 import           Laws (cvrdtLaws)