diff --git a/README.md b/README.md
index 9daea07df..e32d68c7e 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ __Libraries must have notable popularity, 100 watchers on GitHub would be a good
 2. Add your library (following the conventions of this repository)
   * 1 library per pull request
   * include a package.json in the npm format (see `test/schemata/npm-package.json` for details - it's very simple)
+  * Run `npm test` on your repo once you've added a library to check everything is ok
 3. Send us a pull request.
   * Make sure you include in the pull description:
       1. Where you downloaded the script