diff --git a/CHANGES b/CHANGES
--- a/CHANGES
+++ b/CHANGES
@@ -21,3 +21,9 @@
 
 0.1.1.5:
 		fixed y limits in Histogram2D.fromLimitsIO
+
+0.1.2.1:
+		fixed Histogram(2D)PDF sampling
+
+0.1.2.2:
+		
diff --git a/INSTALL b/INSTALL
--- a/INSTALL
+++ b/INSTALL
@@ -1,35 +1,17 @@
 -----------------------------------------------
- A simple signal processing library for Haskell
+A binding to GSL statistics library for Haskell
 -----------------------------------------------
 
 INSTALLATION
 
-Recommended method (ok in Ubuntu/Debian systems):
-    $ cabal install hsignal
-
-INSTALLATION ON WINDOWS ----------------------------------------
-
-1) Install a recent ghc (e.g. ghc-6.10.3)
-
-2) Install cabal-install. A binary for windows can be obtained from:
-
-   http://www.haskell.org/cabal/release/cabal-install-0.6.2/cabal.exe
-
-   Put it somewhere in the path, for instance in c:\ghc\ghc-6.10.3\bin
-
-3) Download and uncompress hmatrix-x.y.z.tar.gz from Hackage:
-
-   http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hmatrix
-
-4) Open a terminal, cd to the hmatrix folder, and run
-
-   > cabal install
-
-5) Download and uncompress hsignal-x.y.z.tar.gz from Hackage:
-
-   http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hsignal
+cabal install hmatrix-gsl-stats
 
-6) Open a terminal, cd to the hsignal folder, and run
+OR
 
-   > cabal install
+tar xzf hmatrix-gsl-stats-x.y.z.tar.gz
+cd hmatrix-gsl-stats
+runhaskell Setup.lhs configure
+runhaskell Setup.lhs build
+runhaskell Setup.lhs hadock
+runhaskell Setup.lhs install
 
diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,2 +1,2 @@
-Copyright Alberto Ruiz 2006-2007
+Copyright A.V.H. McPhail 2010
 GPL license
diff --git a/hmatrix-gsl-stats.cabal b/hmatrix-gsl-stats.cabal
--- a/hmatrix-gsl-stats.cabal
+++ b/hmatrix-gsl-stats.cabal
@@ -1,5 +1,5 @@
 Name:               hmatrix-gsl-stats
-Version:            0.1.1.5
+Version:            0.1.2.1
 License:            GPL
 License-file:       LICENSE
 Copyright:          (c) A.V.H. McPhail 2010
diff --git a/lib/Numeric/GSL/Histogram.hs b/lib/Numeric/GSL/Histogram.hs
--- a/lib/Numeric/GSL/Histogram.hs
+++ b/lib/Numeric/GSL/Histogram.hs
@@ -502,12 +502,12 @@
                             withForeignPtr h $ \h' -> check "pdf_init" $ histogram_pdf_init p'' h'
                         return $ P p'
 
--- | given a randomm from the uniform distribution [0,1], draw a random sample from the PDF
-sample :: HistogramPDF -> Double
-sample (P p) = unsafePerformIO $ withForeignPtr p $ \p' -> histogram_pdf_sample p'
+-- | given a random number from the uniform distribution [0,1], draw a random sample from the PDF
+sample :: HistogramPDF -> Double -> Double
+sample (P p) r = unsafePerformIO $ withForeignPtr p $ \p' -> histogram_pdf_sample p' r
 
 foreign import ccall "gsl-histogram.h gsl_histogram_pdf_init" histogram_pdf_init :: PDFHandle -> HistHandle -> IO CInt
-foreign import ccall "gsl-histogram.h gsl_histogram_pdf_sample" histogram_pdf_sample :: PDFHandle -> IO Double
+foreign import ccall "gsl-histogram.h gsl_histogram_pdf_sample" histogram_pdf_sample :: PDFHandle -> Double -> IO Double
 
 -----------------------------------------------------------------------------
 -----------------------------------------------------------------------------
diff --git a/lib/Numeric/GSL/Histogram2D.hs b/lib/Numeric/GSL/Histogram2D.hs
--- a/lib/Numeric/GSL/Histogram2D.hs
+++ b/lib/Numeric/GSL/Histogram2D.hs
@@ -589,11 +589,11 @@
                                                 return $ P p'
 
 -- | given a randomm from the uniform distribution [0,1], draw a random sample from the PDF
-sample :: Histogram2DPDF -> Double
-sample (P p) = unsafePerformIO $ withForeignPtr p $ \p' -> histogram2d_pdf_sample p'
+sample :: Histogram2DPDF -> Double -> Double
+sample (P p) r = unsafePerformIO $ withForeignPtr p $ \p' -> histogram2d_pdf_sample p' r
 
 foreign import ccall "gsl-histogram2d.h gsl_histogram2d_pdf_init" histogram2d_pdf_init :: PDFHandle -> Hist2DHandle -> IO CInt
-foreign import ccall "gsl-histogram2d.h gsl_histogram2d_pdf_sample" histogram2d_pdf_sample :: PDFHandle -> IO Double
+foreign import ccall "gsl-histogram2d.h gsl_histogram2d_pdf_sample" histogram2d_pdf_sample :: PDFHandle -> Double -> IO Double
 
 -----------------------------------------------------------------------------
 -----------------------------------------------------------------------------