diff --git a/src/serialization/sb3.js b/src/serialization/sb3.js
index 95477f5a2..c264e9fbf 100644
--- a/src/serialization/sb3.js
+++ b/src/serialization/sb3.js
@@ -50,7 +50,6 @@ const serializeBlock = function (block) {
 };
 
 const serializeBlocks = function (blocks) {
-    // TODO Array or object?
     const obj = Object.create(null);
     for (const blockID in blocks) {
         obj[blockID] = serializeBlock(blocks[blockID]);