diff --git a/docs/eventing/broker-trigger.md b/docs/eventing/broker-trigger.md
index 44c87f3e57b..551e1ac3c2e 100644
--- a/docs/eventing/broker-trigger.md
+++ b/docs/eventing/broker-trigger.md
@@ -261,7 +261,8 @@ curl -v "http://default-broker.default.svc.cluster.local/" \
 
 #### Knative Source
 
-Provide the Knative Source the `default` `Broker` as its sink:
+Provide the Knative Source the `default` `Broker` as its sink
+(note you'll need to use `ko apply -f <source_file>.yaml` to create it):
 
 ```yaml
 apiVersion: sources.eventing.knative.dev/v1alpha1
@@ -269,7 +270,18 @@ kind: ContainerSource
 metadata:
   name: heartbeats-sender
 spec:
-  image: github.com/knative/eventing-sources/cmd/heartbeats/
+  image: github.com/knative/eventing-contrib/cmd/heartbeats/
+  args:
+    - --eventType=dev.knative.foo.bar
+  env:
+    - name: POD_NAME
+      valueFrom:
+        fieldRef:
+          fieldPath: metadata.name
+    - name: POD_NAMESPACE
+      valueFrom:
+        fieldRef:
+          fieldPath: metadata.namespace
   sink:
     apiVersion: eventing.knative.dev/v1alpha1
     kind: Broker