diff --git a/README.md b/README.md
index b7aa0003..694672e9 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,9 @@ Additionally all supported modules have an appropriate `*_info`-module to gather
 
 4. An [inventory plugin](plugins/inventory) to use hosts and groups defined in Icinga as a dynamic inventory.
 
-Required Ansible version: 2.9.10
+Required Ansible version: 2.14.0
+
+Recommended Icinga-Director version: 2.11.1
 
 ## Installation
 
@@ -194,6 +196,10 @@ failed: [localhost] => {"ansible_loop_var": "item", "changed": false, "item": "l
 
 ## Known Errors with different Director versions
 
+### Director 1.11.1
+
+When creating notifications that contain the `users`-parameter, the task might not be idempotent ([see](https://github.com/Icinga/icingaweb2-module-director/issues/2882)).
+
 ### Director 1.11.0
 
 You cannot create usergroups because of invalid property assign_filter ([see](https://github.com/telekom-mms/ansible-collection-icinga-director/issues/228)).
diff --git a/meta/runtime.yml b/meta/runtime.yml
index 6d1ae61a..96f7fcac 100644
--- a/meta/runtime.yml
+++ b/meta/runtime.yml
@@ -1,5 +1,5 @@
 ---
-requires_ansible: '>=2.9.10'
+requires_ansible: ">=2.14.0"
 
 action_groups:
   icinga:
diff --git a/plugins/modules/icinga_notification.py b/plugins/modules/icinga_notification.py
index b637a28a..7e657edf 100644
--- a/plugins/modules/icinga_notification.py
+++ b/plugins/modules/icinga_notification.py
@@ -121,6 +121,7 @@
       - User Groups that should be notified by this notification.
     type: "list"
     elements: str
+    default: []
     version_added: '1.16.0'
   append:
     description:
@@ -225,7 +226,7 @@ def main():
         notification_interval=dict(type="int", required=False),
         states=dict(type="list", elements="str", required=False),
         users=dict(type="list", elements="str", required=False),
-        user_groups=dict(type="list", elements="str", required=False),
+        user_groups=dict(type="list", elements="str", default=[], required=False),
         types=dict(type="list", elements="str", required=False),
         vars=dict(type="dict", default={}, required=False),
         period=dict(required=False, aliases=["time_period"]),