diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -8,8 +8,6 @@
 * all fields of the constructor need to be GStorable.
 * implement a Generic instance (`derive (Generic)`)
 
-In order to achieve the same performance as for hand-written instances, take a look at [derive-storable-plugin](https://hackage.haskell.org/package/derive-storable-plugin).
-
 # Usage
 
 Here's an example:
@@ -47,4 +45,6 @@
 
 ```
 
+#Optimisation
 
+There are some problems with performance of derived Storable instances. For now there exists a solution in form of GHC Core plugin - [derive-storable-plugin](https://hackage.haskell.org/package/derive-storable-plugin).
diff --git a/derive-storable.cabal b/derive-storable.cabal
--- a/derive-storable.cabal
+++ b/derive-storable.cabal
@@ -1,6 +1,6 @@
 name:                derive-storable
 
-version:             0.1.0.4
+version:             0.1.0.5
 synopsis:            Derive Storable instances with GHC.Generics.           
 
 description:         Derive Storable instances with GHC.Generics. The derived Storable instances have the same alignment as C structs.
@@ -53,10 +53,3 @@
   type:                git
   location:            https://github.com/mkloczko/derive-storable
   branch:              master
-
-
-source-repository this
-  type:                git
-  location:            https://github.com/mkloczko/derive-storable
-  branch:              master
-  tag:                 bb5cc5d3fa34c8346fda84898606ea3c120ea131