diff --git a/deployment/data-model.nix b/deployment/data-model.nix
index fedbd2f7..502071e1 100644
--- a/deployment/data-model.nix
+++ b/deployment/data-model.nix
@@ -171,6 +171,7 @@ in
       description = "Deployment of a configuration of applications to a run-time environment";
       type = attrsOf deployment;
     };
+    # XXX should this be more ephemeral than something that just.. exists?
     migrations = mkOption {
       description = "Migrations from Fediversity deployments to Fediversity run-time environments";
       type = attrsOf migration;