diff --git a/lib/bill-math.js b/lib/bill-math.js
index a64c3282..2e1542e3 100644
--- a/lib/bill-math.js
+++ b/lib/bill-math.js
@@ -11,6 +11,11 @@ exports.makeChange = function makeChange (cassettes, amount) {
   // Note: Everything here is converted to primitive numbers,
   // since they're all integers, well within JS number range,
   // and this is way more efficient in a tight loop.
+
+  // Another note: While this greedy algorithm possibly works for all major denominations,
+  // it still requires a fallback for cases where it might not provide any solution.
+  // Example: Denominations: [3, 5, 10] | User inputs 4 times the [3] button, resulting in a 12 fiat tx
+  // This algorithm resolves for 1 x [10], and can't resolve the remainder of 2
   const cassetteMap = _.map(cassettes, it => ({
     denomination: it.denomination
   }))