diff --git a/README.md b/README.md
index 4b0c417..7a5fc73 100755
--- a/README.md
+++ b/README.md
@@ -635,7 +635,7 @@ If you submit a pull request, thanks! There are a couple rules to follow though
 * The pull request should be atomic, i.e. contain only one feature. If it contains more, please submit multiple pull requests. Reviewing massive, 1000 loc+ pull requests is extremely hard.
 * Likewise, if for one unique feature the pull request grows too large (more than 200 loc tests not included), please get in touch first.
 * Please stick to the current coding style. It's important that the code uses a coherent style for readability.
-* Don't forget tests for your new feature.
+* Don't forget tests for your new feature. Also don't forget to run the whole test suite before submitting to make sure you didn't introduce regressions.
 * Do not build the browser version in your branch, I'll take care of it once the code is merged.
 
 ## Bug reporting guidelines