diff --git a/.github/workflows/check-certificates.yml b/.github/workflows/check-certificates.yml
index 14166cf4..27e92276 100644
--- a/.github/workflows/check-certificates.yml
+++ b/.github/workflows/check-certificates.yml
@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-certificates.md
 name: Check Certificates
 
 # See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows