diff --git a/meta/runtime.yml b/meta/runtime.yml
index cab4401a..1c95bb57 100644
--- a/meta/runtime.yml
+++ b/meta/runtime.yml
@@ -129,6 +129,10 @@ plugin_routing:
       deprecation:
         removal_version: "6.0.0"
         warning_text: Filter, find_clusters, is no longer supported.
+    flatten_dict_list:
+      deprecation:
+        removal_version: "6.0.0"
+        warning_text: Filter, flatten_dict_list, is no longer supported.
   action:
     host_config:
       deprecation:
diff --git a/plugins/filter/flatten_dict_list.yml b/plugins/filter/flatten_dict_list.yml
index 872998e9..a5bc5bc6 100644
--- a/plugins/filter/flatten_dict_list.yml
+++ b/plugins/filter/flatten_dict_list.yml
@@ -4,6 +4,9 @@ DOCUMENTATION:
   short_description: flatten_dict_list
   description: flatten_dict_list
   version_added: "2.0.0"
-
+  deprecated:
+    removed_in: "6.0.0"
+    alternative: none
+    why: No longer supported.
 EXAMPLES:
 RETURN: