diff --git a/array.cabal b/array.cabal
index 81a2cbea30c54ba0c61a2c87e52449e47bf57e07..198aa6bb772765d0b3f9ab548f6c5f4f092467d9 100644
--- a/array.cabal
+++ b/array.cabal
@@ -4,6 +4,7 @@ license:    BSD3
 license-file:    LICENSE
 maintainer:    libraries@haskell.org
 synopsis:   Mutable and immutable arrays
+category:   Data Structures
 description:
     This package defines the classes @IArray@ of immutable arrays and
     @MArray@ of arrays mutable within appropriate monads, as well as