diff --git a/NXT.cabal b/NXT.cabal
--- a/NXT.cabal
+++ b/NXT.cabal
@@ -1,5 +1,5 @@
 Name:                NXT
-Version:             0.1.3
+Version:             0.1.4
 Synopsis:            A Haskell interface to Lego Mindstorms NXT
 Description:         A Haskell interface to Lego Mindstorms NXT over Bluetoooth. It supports direct commands, messages and
                      many sensors (also unofficial). It has also support for a simple message-based control of a NXT brick
@@ -59,7 +59,7 @@
   HS-source-dirs:      src
   Build-depends:       base >= 4 && < 5,
                        mtl >= 1.1 && < 2,
-                       NXT == 0.1.3
+                       NXT == 0.1.4
   GHC-options:         -Wall
 
 Executable nxt-upload
@@ -69,7 +69,7 @@
                        mtl >= 1.1 && < 2,
                        bytestring >= 0.9 && < 1,
                        filepath >= 1.1 && < 2,
-                       NXT == 0.1.3
+                       NXT == 0.1.4
   GHC-options:         -Wall
   GHC-prof-options:    -Wall
   GHC-shared-options:  -Wall
diff --git a/lib/Robotics/NXT/Errors.hs b/lib/Robotics/NXT/Errors.hs
--- a/lib/Robotics/NXT/Errors.hs
+++ b/lib/Robotics/NXT/Errors.hs
@@ -60,6 +60,6 @@
 {-|
 Exception for NXT interface errors. Currently only one exception is defined which takes textual description as an argument.
 -}
-data (Show a, Typeable a) => NXTException a = NXTException a deriving (Show, Typeable)
+data NXTException = NXTException String deriving (Show, Typeable)
 
-instance (Show a, Typeable a) => Exception (NXTException a)
+instance Exception NXTException
diff --git a/lib/Robotics/NXT/Internals.hs b/lib/Robotics/NXT/Internals.hs
--- a/lib/Robotics/NXT/Internals.hs
+++ b/lib/Robotics/NXT/Internals.hs
@@ -24,6 +24,9 @@
     lastkeepalive :: Maybe POSIXTime -- last time keep alive has been sent
   }
 
+instance Show NXTInternals where
+  show _ = "NXTInternals"
+
 {-|
 Runs a computation in a context of a given 'NXTInternals' token, returning a value and a new token.
 -}
diff --git a/lib/Robotics/NXT/Protocol.hs b/lib/Robotics/NXT/Protocol.hs
--- a/lib/Robotics/NXT/Protocol.hs
+++ b/lib/Robotics/NXT/Protocol.hs
@@ -93,11 +93,9 @@
   
   -- * Internals
   -- | Be careful when using those functions as you have to assure your program is well-behaved: you should see 'NXTInternals' as a
-  -- token you have to pass around in order, not reusing or copying values. They are exposed so that you can decouple initalization,
-  -- execution and termination phase. If you do not need that use 'withNXT'.
-  --
-  -- For example, using 'bracket' is not the best way to combine them together as token returned from 'initialize' in \"acquire resource\"
-  -- phase is reused in \"release resource\" phase even if it was otherwise used in-between. Really use 'withNXT' for that.
+  -- token you have to pass around in order, not reusing or copying values. (The only exception is that you can reuse the token
+  -- initally returned by 'initialize' in 'terminate' call, even if you have used it in-between.) They are exposed so that you can
+  -- decouple initalization, execution and termination phase. If you do not need that use 'withNXT'.
   initialize,
   terminate,
   runNXT,