diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,13 +4,26 @@
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
-## [0.1.2] - 2019-06-17
+## Unreleased
 
 ### Added
 
-* Compatibility with ghc-8.6.
-* Bind API for attributes and basic thread operations.
-* Check for -threaded.
+### Changed
+
+## [0.2.0] - 2017-11-06
+
+### Added
+
+* Bindings for managing threads (create, join, exit, cancel).
+* Requirement to link with -threaded if using the new bindings.
+* Tests for create, join and exit.
+* An exception datatype for the boundness check.
+
+### Changed
+
+* Renamed module to System.Posix.Thread.
+* Renamed functions to createKey and deleteKey.
+* Show error code on failure.
 
 ## [0.1.1] - 2017-09-28
 
diff --git a/pthread.cabal b/pthread.cabal
--- a/pthread.cabal
+++ b/pthread.cabal
@@ -1,5 +1,5 @@
 name:                pthread
-version:             0.1.2
+version:             0.2.0
 synopsis:            Bindings for the pthread library.
 homepage:            http://github.com/tweag/pthread
 license:             BSD3
@@ -25,7 +25,7 @@
   exposed-modules:
     System.Posix.Thread
   build-depends:
-    base >= 4.9.0.0 && < 5,
+    base > 4.9.0.0 && < 5,
     generic-deriving >= 1.11
   default-language: Haskell2010
 
diff --git a/src/System/Posix/Thread.hsc b/src/System/Posix/Thread.hsc
--- a/src/System/Posix/Thread.hsc
+++ b/src/System/Posix/Thread.hsc
@@ -40,7 +40,6 @@
 import Control.Exception (Exception, bracket_, throwIO)
 import Control.Monad (forM_, unless, when)
 import Data.Monoid (First(..))
-import Data.Semigroup (Semigroup(..))
 import Foreign.C.Types
 import Foreign.C.Error (Errno(..), errnoToIOError)
 import Foreign.Marshal.Alloc (alloca)
@@ -68,7 +67,6 @@
 create :: IO (Ptr a) -> IO ThreadId
 create action =
     alloca $ \tidPtr -> do
-      unless rtsSupportsBoundThreads (error "Use -threaded RTS.")
       fptr <- wrap $ \_ -> action
       throwIfNonZero_ $ pthread_create tidPtr nullPtr fptr nullPtr
       peek tidPtr
@@ -90,7 +88,6 @@
 createWithAttributes attrs action =
     alloca $ \tidPtr ->
     alloca $ \attrsPtr -> do
-      unless rtsSupportsBoundThreads (error "Use -threaded RTS.")
       bracket_
         (throwIfNonZero_ $ pthread_attr_init attrsPtr)
         (throwIfNonZero_ $ pthread_attr_destroy attrsPtr) $ do
@@ -226,12 +223,9 @@
   , stackSize :: First CSize
   } deriving (Generic, Show)
 
-instance Semigroup AttributesMonoid where
-  (<>) = mappenddefault
-
 instance Monoid AttributesMonoid where
   mempty = memptydefault
-  mappend = (<>)
+  mappend = mappenddefault
 
 monoidFromAttributes :: Attributes -> AttributesMonoid
 monoidFromAttributes Attributes{..} =