1 files changed, 18 insertions, 3 deletions

diff --git a/word64-map/word64-map.cabal b/word64-map/word64-map.cabal
index 938d2e22..576046e8 100644
--- a/word64-map/word64-map.cabal
+++ b/word64-map/word64-map.cabal
@@ -3,18 +3,25 @@
 
 name:                word64-map
 version:             0.1.0.0
--- synopsis:
--- description:
+synopsis: 64-bit Version of IntMap
+description: This is a wrapper around 'Data.IntMap', from the containers package, but with a
+             guaranteed bitwidth of 64 bits.
+
+             On 32 bit platforms, this is currently accomplished simply by composing two IntMaps.
+
+             On obvious 64 bit platforms(platform name as shown by System.Info.arch ends in 64) 
+             it is simply a newtype of IntMap.
 license:             BSD3
 license-file:        LICENSE
 author:              James Crayne
-maintainer:          jim.crayne@gmail.com
+maintainer:          James Crayne <jim.crayne@gmail.com>
 -- copyright:
 -- category:
 build-type:          Simple
 extra-source-files:  CHANGELOG.md
 cabal-version:       >=1.10
 
+
 library
   exposed-modules:     Data.Word64Map
   -- other-modules:
@@ -24,3 +31,11 @@ library
         , containers
   hs-source-dirs:      src
   default-language:    Haskell2010
+  if arch(x86_64)
+    Cpp-options: -DKNOWN64
+  if arch(ppc64)
+    Cpp-options: -DKNOWN64
+  if arch(ia64)
+    Cpp-options: -DKNOWN64
+  if arch(arm64)
+    Cpp-options: -DKNOWN64