From 031b2047a692cd5b66cd40c3d5b9d58f8fce0e1c Mon Sep 17 00:00:00 2001
From: Filip Krawczyk <kotmawszy@gmail.com>
Date: Thu, 4 Jan 2024 15:42:35 +0100
Subject: [PATCH] Add comment to ArrayU32AppendFelt

---
 src/common/array_append.cairo | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/common/array_append.cairo b/src/common/array_append.cairo
index 387246e81..4a173f1f0 100644
--- a/src/common/array_append.cairo
+++ b/src/common/array_append.cairo
@@ -33,6 +33,8 @@ impl ArrayU32AppendU256 of ArrayAppendTrait<u32, u256> {
     }
 }
 
+// input's MSB is padded with 0s
+// (internally felt252 is converted to u256)
 impl ArrayU32AppendFelt of ArrayAppendTrait<u32, felt252> {
     fn append_little_endian(ref self: Array<u32>, element: felt252) {
         self.append_little_endian(Into::<felt252, u256>::into(element));