diff --git a/rulebooks/README.md b/rulebooks/README.md
index 2f8221f..c767eb5 100644
--- a/rulebooks/README.md
+++ b/rulebooks/README.md
@@ -318,7 +318,7 @@ activation-job-1   0/1           8m45s      11m
 By this Job, new Pod that `ansible-rulebook` running on is also created.
 
 ```bash
-$ JOB_NAME=$(kubectl -n eda get job -l activation-id=${ACTIVATION_ID} -o name | cut -d '/' -f 2)
+$ JOB_NAME=$(kubectl -n eda get job -l activation-id=${ACTIVATION_ID} -o jsonpath={.items[0].metadata.labels.job-name})
 $ kubectl -n eda get pod -l job-name=${JOB_NAME}
 NAME                     READY   STATUS    RESTARTS   AGE
 activation-job-1-h9kjt   1/1     Running   0          11m
@@ -360,6 +360,17 @@ spec:
                   number: 5000
 ```
 
+Modify `replicas` for `worker` in the same file. The number of rulebooks that can be activated simultaneously is equal to the number of this value.
+
+```yaml
+  ...
+  worker:
+    replicas: 2    👈👈👈
+    resource_requirements:
+      requests: {}
+  ...
+```
+
 By applying this file, your webhook can be accessed on the URL `https://eda.example.com/webhooks/demo`.
 
 ```bash
diff --git a/rulebooks/controller/eda.yaml b/rulebooks/controller/eda.yaml
index b083e5b..2add8de 100644
--- a/rulebooks/controller/eda.yaml
+++ b/rulebooks/controller/eda.yaml
@@ -32,7 +32,7 @@ spec:
     resource_requirements:
       requests: {}
   worker:
-    replicas: 1
+    replicas: 2
     resource_requirements:
       requests: {}
   redis: