diff --git a/modern/src/runtime/Config.ts b/modern/src/runtime/Config.ts
index 67972269..74b9ead9 100644
--- a/modern/src/runtime/Config.ts
+++ b/modern/src/runtime/Config.ts
@@ -15,6 +15,9 @@ class Config extends MakiObject {
 
   newitem(item_name: string, item_guid: string) {
     unimplementedWarning("newitem");
+    // @ts-ignore Currently ConfigItem has no XMLNode which is busted, but
+    // should change once we get better machanisms for adding children to a
+    // mutable XML state tree.
     return new ConfigItem(null, this);
   }
 
diff --git a/tsconfig.json b/tsconfig.json
index 26f1f5de..ce9f6eef 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -22,7 +22,9 @@
     "modern/src/runtime/GuiObject.ts",
     "modern/src/runtime/Layout.ts",
     "modern/src/runtime/Group.ts",
-    "modern/src/runtime/Timer.ts"
+    "modern/src/runtime/Timer.ts",
+    "modern/src/runtime/Config.ts",
+    "modern/src/runtime/ConfigItem.ts"
   ],
   "exclude": ["node_modules", "**/*.spec.ts", "demo/built"]
 }