diff --git a/mbed-tls-restricted-pr-test-parametrized.yaml b/mbed-tls-restricted-pr-test-parametrized.yaml
index ea3f8cc..b6fe386 100644
--- a/mbed-tls-restricted-pr-test-parametrized.yaml
+++ b/mbed-tls-restricted-pr-test-parametrized.yaml
@@ -1,6 +1,12 @@
 - job:
     concurrent: true
-    description: Mbed TLS parametrized test PR job
+    description: |
+      Mbed TLS PR job on a chosen branch of <tt>mbedtls-test</tt>.
+      <p>
+      Check at least one of the <tt>RUN_</tt> parameters!
+      Otherwise not much will happen.
+      <p>
+      Choose the branch of <tt>mbedtls-test</tt> under <tt>TEST_BRANCH</tt>.
     disabled: false
     name: mbed-tls-restricted-pr-test-parametrized
     parameters: