diff --git a/core-principles/testing.md b/core-principles/testing.md
index 807ad93..aff646f 100644
--- a/core-principles/testing.md
+++ b/core-principles/testing.md
@@ -1,6 +1,6 @@
 # Testing – Contract Validation
 Every API description (contract) SHOULD be tested against its API implementation. The tests MUST be concluded using the [Dredd testing framework](https://github.com/apiaryio/dredd). The Dredd MUST [report the test results to Apiary](https://help.apiary.io/tools/automated-testing/testing-reporter/). 
 
-In addition to local runs, the tests SHOULD be an integral part the API implementation's CI/CD pipeline.
+In addition to local runs, the tests SHOULD be an integral part the API implementation's CI/CD pipeline. The CI/CD pipeline SHOULD be configured to run the test whenever there is a change to either API description (contract) or its implementation.