diff --git a/bytestring-from.cabal b/bytestring-from.cabal
--- a/bytestring-from.cabal
+++ b/bytestring-from.cabal
@@ -1,5 +1,5 @@
 name:                bytestring-from
-version:             0.2
+version:             0.2.1
 synopsis:            A type-class to convert values from ByteString.
 license:             OtherLicense
 license-file:        LICENSE
diff --git a/src/Data/ByteString/From.hs b/src/Data/ByteString/From.hs
--- a/src/Data/ByteString/From.hs
+++ b/src/Data/ByteString/From.hs
@@ -6,6 +6,7 @@
 
 module Data.ByteString.From
     ( FromByteString (..)
+    , fromByteString
     , runParser
     ) where
 
@@ -23,14 +24,12 @@
 
 import qualified Data.ByteString.Lazy as Lazy
 
--- | Parse 'ByteString's as typed values.
---
--- Minimal complete definition: 'parser'.
+-- | Parse 'ByteString's.
 class FromByteString a where
     parser :: Parser a
 
-    fromByteString :: ByteString -> Maybe a
-    fromByteString = either (const Nothing) Just . runParser parser
+fromByteString :: FromByteString a => ByteString -> Maybe a
+fromByteString = either (const Nothing) Just . runParser parser
 
 runParser :: Parser a -> ByteString -> Either String a
 runParser p b = case feed (parse p b) "" of