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diff --git a/packages/base/src/Numeric/LinearAlgebra/HMatrix/Util.hs b/packages/base/src/Numeric/LinearAlgebra/HMatrix/Util.hs
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+++ b/packages/base/src/Numeric/LinearAlgebra/HMatrix/Util.hs
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+-----------------------------------------------------------------------------
+{- |
+Module      :  Numeric.LinearAlgebra.HMatrix.Util
+Copyright   :  (c) Alberto Ruiz 2015
+License     :  BSD3
+Maintainer  :  Alberto Ruiz
+Stability   :  provisional
+
+-}
+-----------------------------------------------------------------------------
+
+module Numeric.LinearAlgebra.HMatrix.Util(
+    -- * Tools for the Kronecker product
+    --
+    -- | (see A. Fusiello, A matter of notation: Several uses of the Kronecker product in
+    --  3d computer vision, Pattern Recognition Letters 28 (15) (2007) 2127-2132)
+
+    --
+    -- | @`vec` (a \<> x \<> b) == ('trans' b ` 'kronecker' ` a) \<> 'vec' x@
+    vec,
+    vech,
+    dup,
+    vtrans
+) where
+
+import Numeric.LinearAlgebra.Util
+