diff --git a/src/ops/tools/ansible.md b/src/ops/tools/ansible.md
index 7e9fadd..3f8d771 100644
--- a/src/ops/tools/ansible.md
+++ b/src/ops/tools/ansible.md
@@ -49,4 +49,18 @@ import_tasks.
 ```
 
 `ìnclude_tasks` will add all tasks to play run, even if the when condition is
-false.
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+false.
+
+## Exec task(s) if a specific service is found
+
+```yaml
+- name: Is Docker running ?
+  service_facts:
+
+- name: Push Telegraf docker input config if needed
+  template:
+    src: inputs/input.docker.conf.j2
+    dest: /etc/telegraf/telegraf.d/input.docker.conf
+  notify: reload telegraf
+  when: "'docker' in services"
+```
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