diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 56ee05e..bee9f96 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -123,7 +123,8 @@ Other references
 
 ## Testing
 
-Run tests during development with `yarn test` to re-run tests on file changes.
+Run tests during development with `yarn test --watch` to re-run tests on file
+changes.
 
 ### Examples