diff --git a/System/Random/Xorshift128Plus.hs b/System/Random/Xorshift128Plus.hs
--- a/System/Random/Xorshift128Plus.hs
+++ b/System/Random/Xorshift128Plus.hs
@@ -44,8 +44,10 @@
 --   let (v, gen') = 'next01' gen
 -- @
 module System.Random.Xorshift128Plus(
+  -- * Gen: pseudo-random number generator
   Gen(..),
   initialize,
+  -- * generate random number
   next,
   next01,
   next#
diff --git a/Xorshift128Plus.cabal b/Xorshift128Plus.cabal
--- a/Xorshift128Plus.cabal
+++ b/Xorshift128Plus.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                Xorshift128Plus
-version:             0.1.0.0
+version:             0.1.0.1
 synopsis:            Pure haskell implementation of xorshift128plus random number generator.
 description:
             This package contains pure haskell implementation of
@@ -12,7 +12,7 @@
             so that which is not encapusulated for simplicity.
             .
             Please see <http://xorshift.di.unimi.it/xorshift128plus.c original C implementation>
-            and <http://xorshift.di.unimi.it/ comparison of otther algorithms>.
+            and <http://xorshift.di.unimi.it/ comparison of other algorithms>.
 
 license:             PublicDomain
 license-file:        LICENSE
@@ -28,7 +28,7 @@
   exposed-modules:     System.Random.Xorshift128Plus
   -- other-modules:
   -- other-extensions:
-  build-depends:       base >=4.8 && <4.9
+  build-depends:       base >=4.7 && <4.9
   -- hs-source-dirs:
   default-language:    Haskell2010
   ghc-options:         -O3 -fexcess-precision