diff --git a/README.md b/README.md
index b822d32..08fc0b8 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,8 @@
+![Elm package](https://img.shields.io/elm-package/v/cachix/elm-hashcash)
+
 Implements [HashCash](https://en.wikipedia.org/wiki/Hashcash) in Elm to
 prevent spammers abusing a resource.
 
-[Install devenv](https://devenv.sh/getting-started/) and `devenv shell`.
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+### Development
+
+[Install devenv](https://devenv.sh/getting-started/) and `devenv shell elm-test`.
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