diff --git a/packages/ember-data/lib/transforms/date.js b/packages/ember-data/lib/transforms/date.js
index 62092b0f165..a3d64b196b0 100644
--- a/packages/ember-data/lib/transforms/date.js
+++ b/packages/ember-data/lib/transforms/date.js
@@ -54,8 +54,8 @@ export default Transform.extend({
     } else if (type === "number") {
       return new Date(serialized);
     } else if (serialized === null || serialized === undefined) {
-      // if the value is not present in the data,
-      // return undefined, not null.
+      // if the value is null return null
+      // if the value is not present in the data return undefined
       return serialized;
     } else {
       return null;