diff --git a/Data/Matrix.hs b/Data/Matrix.hs
--- a/Data/Matrix.hs
+++ b/Data/Matrix.hs
@@ -203,7 +203,7 @@
 -- | /O(rows*cols)/. The zero matrix of the given size.
 --
 -- > zero n m =
--- >                 n
+-- >                 m
 -- >   1 ( 0 0 ... 0 0 )
 -- >   2 ( 0 0 ... 0 0 )
 -- >     (     ...     )
diff --git a/matrix.cabal b/matrix.cabal
--- a/matrix.cabal
+++ b/matrix.cabal
@@ -1,5 +1,5 @@
 Name: matrix
-Version: 0.3.4.3
+Version: 0.3.4.4
 Author: Daniel Díaz
 Category: Math
 Build-type: Simple
@@ -29,8 +29,8 @@
   location: git://github.com/Daniel-Diaz/matrix.git
 
 Library
-  Build-depends: base == 4.*
-               , vector >= 0.10 && < 0.11
+  Build-depends: base >= 4.5 && < 5
+               , vector >= 0.10
                , deepseq >= 1.3.0.0 && < 1.5
                , primitive >= 0.5
                , loop >= 0.2