diff --git a/README.md b/README.md
index 6e062df..fd67250 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@ Todo:
 
 - [x] Use Postgresql as a database
 - [x] Expose a simple read-only website.
+- [ ] Last seen agents
 - [ ] Use background tasks for alerting
 - [ ] Add a command to generate new authentication tokens
 - [ ] Task for database cleanup (to run periodically)
@@ -39,6 +40,12 @@ source venv/bin/activate
 pip install -e .
 ```
 
+Prepare a configuration file, you can copy the `config-example.yaml` file and edit it:
+
+```bash
+cp config-example.yaml config.yaml
+```
+
 Then, you can run the server:
 
 ```bash
@@ -77,6 +84,7 @@ general:
 service:
   secrets:
     # Secrets can be generated using `openssl rand -base64 32`.
+    # DO NOT REUSE THESE ONES.
     - "O4kt8Max9/k0EmHaEJ0CGGYbBNFmK8kOZNIoUk3Kjwc"
     - "x1T1VZR51pxrv5pQUyzooMG4pMUvHNMhA5y/3cUsYVs="
 
diff --git a/config-example.yaml b/config-example.yaml
new file mode 100644
index 0000000..150b043
--- /dev/null
+++ b/config-example.yaml
@@ -0,0 +1,44 @@
+general:
+  frequency: "1m" # Run checks every minute.
+  alerts:
+    error:
+      - local
+    warning:
+      - local
+    alert:
+      - local
+service:
+  secrets:
+    # Secrets can be generated using `openssl rand -base64 32`.
+    - "O4kt8Max9/k0EmHaEJ0CGGYbBNFmK8kOZNIoUk3Kjwc"
+    - "x1T1VZR51pxrv5pQUyzooMG4pMUvHNMhA5y/3cUsYVs="
+
+ssl:
+  thresholds:
+    - "1d": critical
+    - "5d": warning
+
+# It's also possible to define the checks in another file
+# with the include syntax:
+# 
+#   websites: !include websites.yaml
+#
+websites:
+    - domain: "https://mypads.framapad.org"
+      paths:
+          - path: "/mypads/"
+            checks:
+                - status-is: 200
+                - body-contains: '<div id= "mypads"></div>'
+                - ssl-certificate-expiration: "on-check"
+          - path: "/admin/"
+            checks:
+                - status-is: 401
+    - domain: "https://munin.framasoft.org"
+      paths:
+          - path: "/"
+            checks:
+                - status-is: 301
+          - path: "/munin/"
+            checks:
+                - status-is: 401
\ No newline at end of file
diff --git a/config.yaml b/config.yaml
deleted file mode 100644
index f4358dd..0000000
--- a/config.yaml
+++ /dev/null
@@ -1,92 +0,0 @@
-general:
-  frequency: "1m" # Run checks every minute.
-  alerts:
-    error:
-      - local
-    warning:
-      - local
-    alert:
-      - local
-service:
-  secrets:
-    # Secrets can be generated using `openssl rand -base64 32`.
-    - "O4kt8Max9/k0EmHaEJ0CGGYbBNFmK8kOZNIoUk3Kjwc"
-    - "x1T1VZR51pxrv5pQUyzooMG4pMUvHNMhA5y/3cUsYVs="
-
-ssl:
-  thresholds:
-    - "1d": critical
-    - "5d": warning
-
-# It's also possible to define the checks in another file
-# with the include syntax:
-# 
-#   websites: !include websites.yaml
-#
-websites:
-  - domain: "https://mypads.framapad.org"
-    paths:
-      - path: "/mypads/"
-        checks:
-          - status-is: "200"
-          - body-contains: '<div id= "mypads"></div>'
-          - ssl-certificate-expiration: "on-check"
-      - path: "/admin/"
-        checks:
-          - status-is: "401"
-  - domain: "https://munin.framasoft.org"
-    paths:
-      - path: "/"
-        checks:
-          - status-is: "301"
-      - path: "/munin/"
-        checks:
-          - status-is: "401"
-  - domain: "https://framagenda.org"
-    paths:
-      - path: "/status.php"
-        checks:
-          - status-is: "200"
-          # Là, idéalement, il faudrait un json-contains,
-          # qui serait une table de hachage
-          - body-contains: '"maintenance":false'
-          - ssl-certificate-expiration: "on-check"
-      - path: "/"
-        checks:
-          - status-is: "302"
-      - path: "/login"
-        checks:
-          - status-is: "200"
-  - domain: "https://framadrive.org"
-    paths:
-      - path: "/status.php"
-        checks:
-          - status-is: "200"
-          - body-contains: '"maintenance":false'
-          - ssl-certificate-expiration: "on-check"
-      - path: "/"
-        checks:
-          - status-is: "302"
-      - path: "/login"
-        checks:
-          - status-is: "200"
-  - domain: "https://cloud.framabook.org"
-    paths:
-      - path: "/status.php"
-        checks:
-          - status-is: "200"
-          - body-contains: '"maintenance":false'
-          - ssl-certificate-expiration: "on-check"
-      - path: "/"
-        checks:
-          - status-is: "302"
-      - path: "/login"
-        checks:
-          - status-is: "200"
-  - domain: "https://framasoft.org"
-    paths:
-      - path: "/"
-        checks:
-          - status-is: "200"
-          - ssl-certificate-expiration: "on-check"
-