diff --git a/roles/matrix-cactus-comments/defaults/main.yml b/roles/matrix-cactus-comments/defaults/main.yml
index f8f6474ac..21dec3d56 100644
--- a/roles/matrix-cactus-comments/defaults/main.yml
+++ b/roles/matrix-cactus-comments/defaults/main.yml
@@ -11,7 +11,7 @@ matrix_cactus_comments_docker_src_files_path: "{{ matrix_cactus_comments_base_pa
 matrix_cactus_comments_base_path: "{{ matrix_base_data_path }}/cactus-comments"
 matrix_cactus_comments_app_service_config_file: "{{ matrix_cactus_comments_base_path }}/cactus_appservice.yaml"
 matrix_cactus_comments_app_service_env_file: "{{ matrix_cactus_comments_base_path }}/cactus.env"
-matrix_synapse_app_service_config_files: {{ matrix_cactus_comments_app_service_config_file }}
+matrix_synapse_app_service_config_files: "{{ matrix_cactus_comments_app_service_config_file }}"
 
 matrix_cactus_comments_as_token: ''
 matrix_cactus_comments_hs_token: ''
@@ -34,3 +34,4 @@ matrix_bot_cactus_comments_systemd_wanted_services_list: []
 # A list of extra arguments to pass to the container
 matrix_cactus_comments_container_extra_arguments: []
 
+matrix_cactus_comments_environment_variables_extension: ''
diff --git a/setup.yml b/setup.yml
index 3b7d235d3..c323de41a 100755
--- a/setup.yml
+++ b/setup.yml
@@ -55,6 +55,7 @@
     - matrix-prometheus
     - matrix-grafana
     - matrix-registration
+    - matrix-cactus-comments
     - matrix-client-element
     - matrix-client-hydrogen
     - matrix-client-cinny