diff --git a/README.md b/README.md
index 2315889..915cd68 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,7 @@ In summary:
 - `npm install` - Install NPM packages used by Diceware
 - `webpack --watch` - Pack Javscript files
 - `http-server`
+- `npm test` - Make sure you didn't break any of the core logic!
 - `./go-sync-to-s3.sh` - Do this if you're me, to upload to S3.  If you're not me, you'll need to do something else, or possibly nothing at all.