diff --git a/primitive.cabal b/primitive.cabal
index 21999a47222e11d42a0da8535eb9da24ef069aa5..3e19e847d3f68fb3ee3710c1eeb32734cda8ce28 100644
--- a/primitive.cabal
+++ b/primitive.cabal
@@ -13,6 +13,10 @@ Description:
         This package provides wrappers for primitive array operations from
         GHC.Prim.
         .
+        Changes in version 0.4.0.1
+        .
+        * Critical bug fix in @fillByteArray@
+        .
         Changes in version 0.4
         .
         * Support for GHC 7.2 array copying primitives