diff --git a/plugins/modules/availability_group.py b/plugins/modules/availability_group.py
index 845301e6..2973ac8c 100644
--- a/plugins/modules/availability_group.py
+++ b/plugins/modules/availability_group.py
@@ -61,7 +61,9 @@
     required: false
   contained_availability_group:
     description:
-    - Indicates whether the availability group is Contained.
+    - Indicates whether the availability group is Contained. Requires DBATools >= 2.1.15
+    type: bool
+    required: false
   database_health_trigger:
     description:
       - Indicates whether the availability group triggers the database health.