diff --git a/src/hamt/consumable-hash.js b/src/hamt/consumable-hash.js
index 3f1c2fdc..6fb40aa0 100644
--- a/src/hamt/consumable-hash.js
+++ b/src/hamt/consumable-hash.js
@@ -42,6 +42,7 @@ class InfiniteHash {
 
         let result = 0
 
+        // TODO: this is sync, no need to use whilst
         whilst(
           () => pendingBits > 0,
           (callback) => {