diff --git a/components/serverless/internal/controllers/serverless/function_reconcile_test.go b/components/serverless/internal/controllers/serverless/function_reconcile_test.go
index f93801c6e..66caddc44 100644
--- a/components/serverless/internal/controllers/serverless/function_reconcile_test.go
+++ b/components/serverless/internal/controllers/serverless/function_reconcile_test.go
@@ -1324,7 +1324,7 @@ func TestFunctionReconciler_Reconcile(t *testing.T) {
 		assertSuccessfulFunctionBuild(t, resourceClient, reconciler, request, fnLabels)
 		assertSuccessfulFunctionDeployment(t, resourceClient, reconciler, request, fnLabels)
 
-		t.Log("updating deployment.spec.template.metadata.annotations, e.g. by using kubectl rollout restart command")
+		t.Log("updating deployment.spec.template.metadata.annotations, e.g. by using kubectl rollout restart command and one custom annotation")
 		deployments := &appsv1.DeploymentList{}
 		g.Expect(resourceClient.ListByLabel(context.TODO(), request.Namespace, fnLabels, deployments)).To(gomega.Succeed())
 		g.Expect(len(deployments.Items)).To(gomega.Equal(1))
@@ -1336,8 +1336,11 @@ func TestFunctionReconciler_Reconcile(t *testing.T) {
 		copiedDeploy := deployment.DeepCopy()
 		const restartedAtAnnotationKey = "kubectl.kubernetes.io/restartedAt"
 		const restartedAtAnnotationValue = "2021-03-10T11:28:01+01:00"
+		const customAnnotationKey = "test"
+		const customAnnotationValue = "value"
 		restartedAtAnnotation := map[string]string{
 			restartedAtAnnotationKey: restartedAtAnnotationValue, // example annotation added by kubectl
+			customAnnotationKey:      customAnnotationValue,
 		}
 		copiedDeploy.Spec.Template.Annotations = restartedAtAnnotation
 		g.Expect(resourceClient.Update(context.Background(), copiedDeploy))
@@ -1373,6 +1376,7 @@ func TestFunctionReconciler_Reconcile(t *testing.T) {
 		g.Expect(deployment).ToNot(gomega.BeNil())
 
 		g.Expect(deployment.Spec.Template.Annotations).To(gomega.HaveKeyWithValue(restartedAtAnnotationKey, restartedAtAnnotationValue))
+		g.Expect(deployment.Spec.Template.Annotations).To(gomega.HaveKeyWithValue(customAnnotationKey, customAnnotationValue))
 	})
 
 	t.Run("should reconcile function with RuntimeImageOverride", func(t *testing.T) {
diff --git a/components/serverless/internal/controllers/serverless/system_state.go b/components/serverless/internal/controllers/serverless/system_state.go
index 680b0a497..735e7ecb8 100644
--- a/components/serverless/internal/controllers/serverless/system_state.go
+++ b/components/serverless/internal/controllers/serverless/system_state.go
@@ -386,25 +386,20 @@ func (s *systemState) podAnnotations() map[string]string {
 	if s.instance.Spec.Annotations != nil {
 		result = labels.Merge(s.instance.Spec.Annotations, result)
 	}
-	result = labels.Merge(s.specialDeploymentAnnotations(), result)
+
+	// merge old and new annotations to allow other components to annotate functions deployment
+	// for example in case when someone use `kubectl rollout restart` on it
+	result = labels.Merge(s.currentAnnotations(), result)
 	return result
 }
 
-func (s *systemState) specialDeploymentAnnotations() map[string]string {
+func (s *systemState) currentAnnotations() map[string]string {
 	deployments := s.deployments.Items
 	if len(deployments) == 0 {
 		return map[string]string{}
 	}
-	deploymentAnnotations := deployments[0].Spec.Template.GetAnnotations()
-	specialDeploymentAnnotations := map[string]string{}
-	for _, k := range []string{
-		"kubectl.kubernetes.io/restartedAt",
-	} {
-		if v, found := deploymentAnnotations[k]; found {
-			specialDeploymentAnnotations[k] = v
-		}
-	}
-	return specialDeploymentAnnotations
+
+	return deployments[0].Spec.Template.GetAnnotations()
 }
 
 type buildDeploymentArgs struct {