diff --git a/co-log-concurrent.cabal b/co-log-concurrent.cabal
--- a/co-log-concurrent.cabal
+++ b/co-log-concurrent.cabal
@@ -1,13 +1,13 @@
 cabal-version:       2.4
 name:                co-log-concurrent
-version:             0.5.0.0
+version:             0.5.1.0
 synopsis:            Asynchronous backend for co-log library
 description:         Buiding block for writing asynchronous logger pipelines.
 homepage:            https://github.com/qnikst/co-log-concurrent/
 bug-reports:         https://github.com/qnikst/co-log-concurrent/issues
 license:             MPL-2.0
 author:              Alexander Vershilov
-maintainer:          alexander.vershilov@gmail.com
+maintainer:          alexander.vershilov@sirius.online
 copyright:           2018-2020 Kowainik, 2020 Alexander Vershilov
 category:            Logging, Contravariant, Comonad
 stability:           provisional
@@ -17,7 +17,7 @@
 
 source-repository head
   type:                git
-  location:            https://github.com/qnikst/co-log-concurrent.git
+  location:            https://github.com/cheopslab/co-log-concurrent.git
 
 common common-options
   build-depends:       base >= 4.10.1.0 && < 4.16
diff --git a/src/Colog/Concurrent/Internal.hs b/src/Colog/Concurrent/Internal.hs
--- a/src/Colog/Concurrent/Internal.hs
+++ b/src/Colog/Concurrent/Internal.hs
@@ -25,8 +25,10 @@
 -}
 #if MIN_VERSION_stm(2,5,0)
 data Capacity = Capacity Natural (Maybe Natural)
+  deriving stock Show
 #else
 data Capacity = Capacity Int (Maybe Natural)
+  deriving stock Show
 #endif
 
 -- | Creates new capacity.