diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Revision history for z-botan
 
+## 0.1.1.2  -- 2020-05-11
+
+* Export 'KeySpec' from `Z.Crypto.Cipher`.
+
 ## 0.1.0.0  -- 2020-05-11
 
 * The very first release.
diff --git a/Setup.hs b/Setup.hs
--- a/Setup.hs
+++ b/Setup.hs
@@ -32,9 +32,12 @@
                     baseDir lbi' = fromMaybe "" (takeDirectory <$> cabalFilePath lbi')
                     configFile = baseDir lbi </> "third_party" </> "botan" </> "configure.py"
                     configFolder = baseDir lbi </> "third_party" </> "botan"
+                    placeholder = "build" </> "include" </> "external" </> "cabal.placeholder"
                 confExists <- doesFileExist configFile
                 if confExists
-                  then runConfigureScript configFolder configFile verbosity flags lbi
+                  then do
+                    runConfigureScript configFolder configFile verbosity flags lbi
+                    runTouch configFolder placeholder verbosity flags
                   else die' verbosity "botan configure script not found."
 
                 postConf simpleUserHooks args flags pkg_descr lbi
@@ -80,4 +83,18 @@
                ++ "This requires python is discoverable in your path."
 
 
-
+runTouch :: FilePath -> FilePath -> Verbosity -> ConfigFlags -> IO ()
+runTouch configFolder placeholder verbosity flags = do
+    let extraPath = fromNubList $ configProgramPathExtra flags
+        progDb = modifyProgramSearchPath
+            (\p -> map ProgramSearchPathDir extraPath ++ p) emptyProgramDb
+        touchPG = simpleProgram "touch"
+    touch <- lookupProgram touchPG <$> configureProgram verbosity touchPG progDb
+    case touch of
+        Just touch' ->
+            runProgramInvocation verbosity $
+                 (programInvocation touch' [placeholder])
+                 { progInvokeCwd = Just configFolder }
+        Nothing -> die' verbosity notFoundMsg
+  where
+      notFoundMsg = "touch is required to keep a cabal placeholder file"
diff --git a/Z-Botan.cabal b/Z-Botan.cabal
--- a/Z-Botan.cabal
+++ b/Z-Botan.cabal
@@ -1,6 +1,6 @@
 cabal-version:      2.4
 name:               Z-Botan
-version:            0.1.1.1
+version:            0.1.1.2
 synopsis:           Crypto for Haskell
 description:        Crypto for Haskell, based on <http://botan.randombit.net/ Botan>
 license:            BSD-3-Clause
diff --git a/Z/Crypto/Cipher.hs b/Z/Crypto/Cipher.hs
--- a/Z/Crypto/Cipher.hs
+++ b/Z/Crypto/Cipher.hs
@@ -16,7 +16,7 @@
 -}
 module Z.Crypto.Cipher
   ( -- * Block Cipher
-    BlockCipherType(..)
+    BlockCipherType(..), KeySpec(..)
   , BlockCipher, blockCipherName, blockCipherKeySpec, blockCipherSize
   , newBlockCipher, setBlockCipherKey, clearBlockCipher
   , encryptBlocks, decryptBlocks
@@ -224,9 +224,9 @@
 --
 data BlockCipher = BlockCipher
     { blockCipher        :: {-# UNPACK #-} !BotanStruct
-    , blockCipherName    :: {-# UNPACK #-} !CBytes
-    , blockCipherSize    :: {-# UNPACK #-} !Int
-    , blockCipherKeySpec :: {-# UNPACK #-} !KeySpec
+    , blockCipherName    :: {-# UNPACK #-} !CBytes          -- ^ block cipher algo name
+    , blockCipherSize    :: {-# UNPACK #-} !Int             -- ^ block cipher block size
+    , blockCipherKeySpec :: {-# UNPACK #-} !KeySpec         -- ^ block cipher keyspec
     }
     deriving (Show, Generic)
     deriving anyclass T.Print
@@ -523,11 +523,12 @@
 -- | A Botan cipher.
 data Cipher = Cipher
     { cipher                  :: {-# UNPACK #-} !BotanStruct
-    , cipherName              :: {-# UNPACK #-} !CBytes
-    , cipherUpdateGranularity :: {-# UNPACK #-} !Int
-    , cipherKeySpec           :: {-# UNPACK #-} !KeySpec
-    , cipherTagLength         :: {-# UNPACK #-} !Int -- ^ This will be zero for non-authenticated ciphers.
-    , defaultNonceLength      :: {-# UNPACK #-} !Int
+    , cipherName              :: {-# UNPACK #-} !CBytes        -- ^ cipher algo name
+    , cipherUpdateGranularity :: {-# UNPACK #-} !Int           -- ^ cipher input chunk granularity
+    , cipherKeySpec           :: {-# UNPACK #-} !KeySpec       -- ^ cipher keyspec
+    , cipherTagLength         :: {-# UNPACK #-} !Int    -- ^ AEAD tag length,
+                                                        -- will be zero for non-authenticated ciphers.
+    , defaultNonceLength      :: {-# UNPACK #-} !Int    -- ^ a proper default nonce length
     }
     deriving (Show, Generic)
     deriving anyclass T.Print
diff --git a/Z/Crypto/MPI.hs b/Z/Crypto/MPI.hs
--- a/Z/Crypto/MPI.hs
+++ b/Z/Crypto/MPI.hs
@@ -11,11 +11,11 @@
 
 -}
 module Z.Crypto.MPI
-  ( -- * RNG
+  ( -- * MPI
     MPI, fromCInt, toWord32, byteSize, Z.Crypto.MPI.bitSize
-    -- * Builder & Parser
+    -- * MPI Builder & Parser
   , toHex, toDecimal, fromHex, fromDecimal
-    -- * Predicator
+    -- * MPI Predicator
   , isNegative, isZero, isOdd, isEven, isPrim
     -- * MPI specific
   , mulMod, powMod, modInverse, Z.Crypto.MPI.gcd