diff --git a/Crypto/Pbkdf2.hs b/Crypto/Pbkdf2.hs
--- a/Crypto/Pbkdf2.hs
+++ b/Crypto/Pbkdf2.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE Safe #-}
 module Crypto.Pbkdf2 (pbkdf2, pbkdf2_iterative) where
 
 import Data.Bits (shiftR)
@@ -38,8 +39,8 @@
 -- calculating everything before it.  Compared to the standard this
 -- function only changes the salt for the initial PBKDF2 value of each
 -- iteration to include a salt iterated from earlier parts of the PBKDF2
--- stream. This can be verified by removing the i from (hash $ B.concat [i,
--- salt, B.pack $ octetsBE c]).
+-- stream. This can be verified by removing the i from (hash $ B.concat
+-- [blockSalt, salt, B.pack $ octetsBE c]).
 --
 -- The added salt for the first iteration will be "", and all following
 -- will be calculated as (PRF output input), where output is the output of
diff --git a/Lazy-Pbkdf2.cabal b/Lazy-Pbkdf2.cabal
--- a/Lazy-Pbkdf2.cabal
+++ b/Lazy-Pbkdf2.cabal
@@ -1,5 +1,5 @@
 Name:           Lazy-Pbkdf2
-Version:        2.1.1
+Version:        2.1.2
 Author:         Marcus Ofenhed <marcus@conditionraise.se>
 Maintainer:     Marcus Ofenhed <marcus@conditionraise.se>
 License:        MIT