diff --git a/aio/tools/transforms/angular-api-package/tag-defs/Annotation.js b/aio/tools/transforms/angular-api-package/tag-defs/Annotation.js
index 4e9c8714cb..49f55d5eec 100644
--- a/aio/tools/transforms/angular-api-package/tag-defs/Annotation.js
+++ b/aio/tools/transforms/angular-api-package/tag-defs/Annotation.js
@@ -1,4 +1,5 @@
-// A ts2dart compiler annotation that can be ignored in API docs.
+// A ts2dart compiler annotation that we don't care about for API docs.
+// But, if we don't have a tag-def for it the doc-gen will error.
 module.exports = function() {
-  return {name: 'Annotation', ignore: true};
+  return {name: 'Annotation'};
 };