diff --git a/roles/custom/matrix-element-call/defaults/main.yml b/roles/custom/matrix-element-call/defaults/main.yml
index f1ab26261..787acf0a1 100644
--- a/roles/custom/matrix-element-call/defaults/main.yml
+++ b/roles/custom/matrix-element-call/defaults/main.yml
@@ -72,6 +72,18 @@ matrix_element_call_container_labels_traefik_additional_response_headers_auto: |
   }}
 matrix_element_call_container_labels_traefik_additional_response_headers_custom: {}
 
+# matrix_client_element_container_labels_additional_labels contains a multiline string with additional labels to add to the container label file.
+# See `../templates/labels.j2` for details.
+#
+# Example:
+# matrix_client_element_container_labels_additional_labels: |
+#   my.label=1
+#   another.label="here"
+matrix_element_call_container_labels_additional_labels: ''
+
+# A list of extra arguments to pass to the container
+matrix_element_call_container_extra_arguments: []
+
 # Additional environment variables for the container
 matrix_element_call_environment_variables_additional: {}