diff --git a/roles/web-app-keycloak/meta/variants.yml b/roles/web-app-keycloak/meta/variants.yml
index 9f752f548c..45a60d3507 100644
--- a/roles/web-app-keycloak/meta/variants.yml
+++ b/roles/web-app-keycloak/meta/variants.yml
@@ -1,3 +1,4 @@
+---
 # Matrix-deploy variant overrides for this role.
 # See docs/contributing/artefact/files/role/variants.md for the file format.
 
diff --git a/roles/web-app-mattermost/meta/variants.yml b/roles/web-app-mattermost/meta/variants.yml
index ddf3ea6a85..03ac98c660 100644
--- a/roles/web-app-mattermost/meta/variants.yml
+++ b/roles/web-app-mattermost/meta/variants.yml
@@ -1,3 +1,4 @@
+---
 # Matrix-deploy variant overrides for web-app-mattermost.
 # See docs/contributing/artefact/files/role/variants.md for the file format.
 
@@ -25,8 +26,8 @@
       enabled: true
       shared: true
 
-# variant pinning every dynamic services.yml flag to false so the
-# matrix also exercises the out-of-group_names branch.
+    # variant pinning every dynamic services.yml flag to false so the
+    # matrix also exercises the out-of-group_names branch.
     css:
       enabled: true
       shared: true