diff --git a/cereal.cabal b/cereal.cabal
--- a/cereal.cabal
+++ b/cereal.cabal
@@ -1,5 +1,5 @@
 name:                   cereal
-version:                0.5.2.0
+version:                0.5.3.0
 license:                BSD3
 license-file:           LICENSE
 author:                 Lennart Kolmodin <kolmodin@dtek.chalmers.se>,
@@ -52,7 +52,7 @@
         type:                   exitcode-stdio-1.0
 
         build-depends:          base == 4.*,
-                                bytestring,
+                                bytestring >= 0.10.8.1,
                                 QuickCheck,
                                 test-framework,
                                 test-framework-quickcheck2,
diff --git a/src/Data/Serialize/Get.hs b/src/Data/Serialize/Get.hs
--- a/src/Data/Serialize/Get.hs
+++ b/src/Data/Serialize/Get.hs
@@ -434,7 +434,8 @@
   s <- ensure n
   put (B.drop n s)
 
--- | Skip ahead @n@ bytes. No error if there isn't enough bytes.
+-- | Skip ahead up to @n@ bytes in the current chunk. No error if there aren't
+-- enough bytes, or if less than @n@ bytes are skipped.
 uncheckedSkip :: Int -> Get ()
 uncheckedSkip n = do
     s <- get
@@ -470,7 +471,8 @@
         _      -> return ()
     return ea
 
--- | Get the next up to @n@ bytes as a ByteString, without consuming them.
+-- | Get the next up to @n@ bytes as a ByteString until end of this chunk,
+-- without consuming them.
 uncheckedLookAhead :: Int -> Get B.ByteString
 uncheckedLookAhead n = do
     s <- get
diff --git a/src/Data/Serialize/Put.hs b/src/Data/Serialize/Put.hs
--- a/src/Data/Serialize/Put.hs
+++ b/src/Data/Serialize/Put.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE FlexibleInstances #-}
 
 #ifndef MIN_VERSION_base
 #define MIN_VERSION_base(x,y,z) 0
@@ -166,6 +167,13 @@
 
     (>>) = (*>)
     {-# INLINE (>>) #-}
+
+instance Monoid (PutM ()) where
+    mempty = pure ()
+    {-# INLINE mempty #-}
+
+    mappend = (*>)
+    {-# INLINE mappend #-}
 
 tell :: Putter Builder
 tell b = Put $! PairS () b
diff --git a/tests/RoundTrip.hs b/tests/RoundTrip.hs
--- a/tests/RoundTrip.hs
+++ b/tests/RoundTrip.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      : 
 -- Copyright   : (c) Galois, Inc, 2009
--- License     : AllRightsReserved
+-- License     : BSD3
 --
 -- Maintainer  : Trevor Elliott <trevor@galois.com>
 -- Stability   :