diff --git a/vars/buildTestDeploy.groovy b/vars/buildTestDeploy.groovy
index 29e003a8040d0d584baa80a955eb7923ee50a9bd..909d8d69cc85af04886686c5cf156a06de5d9c9a 100644
--- a/vars/buildTestDeploy.groovy
+++ b/vars/buildTestDeploy.groovy
@@ -14,9 +14,17 @@ def call(ArrayList<String> dependencyList, String gitUrl='') {
                  'bionic-Release',
                  'tumbleweed-Debug',
                  'tumbleweed-Release' ]
+  def dependencies = dependencyList.join(',')
 
   pipeline {
     agent none
+
+    // setup build trigger
+    triggers {
+      pollSCM 'H/5 * * * *'
+      upstream dependencies
+    }
+
     stages {
       stage('build') {
         // Run the build stages for all labels + build types in parallel, each in a separate docker container
diff --git a/vars/helper.groovy b/vars/helper.groovy
index 43f22caa4bbbf8da79f46b33eddf489233f1fe15..43451690224c37a135d9e53a139e7e085f784a33 100644
--- a/vars/helper.groovy
+++ b/vars/helper.groovy
@@ -8,12 +8,14 @@
 
 def doBuildTestDeploy(ArrayList<String> dependencyList, String label, String buildType, String gitUrl) {
 
+  // prepare source directory and dependencies
   doPrepare(true, gitUrl)
   doDependencyArtefacts(dependencyList, label, buildType)
 
-  // Add inactivity timeout of 10 minutes (build will be interrupted if 10 minutes no log output has been produced)
+  // add inactivity timeout of 10 minutes (build will be interrupted if 10 minutes no log output has been produced)
   timeout(activity: true, time: 10) {
   
+    // start build and tests, then generate artefact
     doBuild(label, buildType)
     doTest(label, buildType)
     doInstall(label, buildType)