diff --git a/slides/k8s/admission.md b/slides/k8s/admission.md
index 681890fd..9c9e0914 100644
--- a/slides/k8s/admission.md
+++ b/slides/k8s/admission.md
@@ -198,21 +198,9 @@ Some examples ...
 
   (the Node "echo" app, the Flask app, and one ngrok tunnel for each of them)
 
-.lab[
+- We will need an ngrok account for the tunnels
 
-- Go to the webhook directory:
-  ```bash
-  cd ~/container.training/webhooks/admission
-  ```
-
-- Start the webhook in Docker containers:
-  ```bash
-  docker-compose up
-  ```
-
-]
-
-*Note the URL in `ngrok-echo_1` looking like `url=https://xxxx.ngrok.io`.*
+  (a free account is fine)
 
 ---
 
@@ -250,6 +238,42 @@ class: extra-details
 
 ---
 
+## Ngrok tokens
+
+- If you're attending a live training, you might have an ngrok token
+
+- Look in `~/ngrok.env` and if that file exists, copy it to the stack:
+
+.lab[
+
+```bash
+cp ~/ngrok.env ~/container.training/webhooks/admission/.env
+```
+
+]
+
+---
+
+## Starting the whole stack
+
+.lab[
+
+- Go to the webhook directory:
+  ```bash
+  cd ~/container.training/webhooks/admission
+  ```
+
+- Start the webhook in Docker containers:
+  ```bash
+  docker-compose up
+  ```
+
+]
+
+*Note the URL in `ngrok-echo_1` looking like `url=https://xxxx.ngrok.io`.*
+
+---
+
 ## Update the webhook configuration
 
 - We have a webhook configuration in `k8s/webhook-configuration.yaml`
diff --git a/webhooks/admission/docker-compose.yml b/webhooks/admission/docker-compose.yml
index af4653d5..c1a27015 100644
--- a/webhooks/admission/docker-compose.yml
+++ b/webhooks/admission/docker-compose.yml
@@ -1,3 +1,11 @@
+# Note: Ngrok doesn't have an "anonymous" mode anymore.
+# This means that it requires an authentication token.
+# That said, all you need is a free account; so if you're
+# doing the labs on admission webhooks and want to try
+# this Compose file, I highly recommend that you create
+# an Ngrok account and set the NGROK_AUTHTOKEN environment
+# variable to your authentication token.
+
 version: "3"
 
 services:
@@ -5,6 +13,8 @@ services:
   ngrok-echo:
     image: ngrok/ngrok
     command: http --log=stdout localhost:3000
+    environment:
+    - NGROK_AUTHTOKEN
     ports:
     - 3000
 
@@ -16,6 +26,8 @@ services:
   ngrok-flask:
     image: ngrok/ngrok
     command: http --log=stdout localhost:5000
+    environment:
+    - NGROK_AUTHTOKEN
     ports:
     - 5000