diff --git a/stable-memo.cabal b/stable-memo.cabal
--- a/stable-memo.cabal
+++ b/stable-memo.cabal
@@ -1,5 +1,5 @@
 name:                stable-memo
-version:             0.2.0
+version:             0.2.1
 synopsis:            Memoization based on argument identity
 license:             MIT
 license-file:        LICENSE
@@ -16,6 +16,10 @@
 
   .
 
+  * stable-memo only evaluates keys to WHNF.
+
+  .
+
   * This can be more suitable for recursive functions over graphs with
     cycles.
 
@@ -98,4 +102,4 @@
 source-repository this
   type:     darcs
   location: http://patch-tag.com/r/jmcarthur/stable-memo
-  tag:      v0.2.0
+  tag:      v0.2.1