diff --git a/Data/Digest/Pure/SHA.hs b/Data/Digest/Pure/SHA.hs
--- a/Data/Digest/Pure/SHA.hs
+++ b/Data/Digest/Pure/SHA.hs
@@ -5,6 +5,7 @@
 module Data.Digest.Pure.SHA
        ( -- * 'Digest' and related functions
          Digest
+       , SHA1State, SHA256State, SHA512State
        , showDigest
        , integerDigest
        , bytestringDigest
diff --git a/SHA.cabal b/SHA.cabal
--- a/SHA.cabal
+++ b/SHA.cabal
@@ -1,6 +1,6 @@
 name:       SHA
 category:   Cryptography, Codec
-version:    1.5.0.1
+version:    1.5.1
 license:    BSD3
 license-file: LICENSE
 author:     Adam Wick <awick@galois.com>, Brian Lewis <brian@lorf.org>