From c61a477d188953605f7e93c17435bbc8324158f3 Mon Sep 17 00:00:00 2001
From: Anna Jablonowska <jablonowska999@gmail.com>
Date: Wed, 29 May 2024 12:38:38 +0200
Subject: [PATCH] Add usefullness of U256

---
 ethereum/circuits/lib/README.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ethereum/circuits/lib/README.md b/ethereum/circuits/lib/README.md
index dacf3135..6c580d5d 100644
--- a/ethereum/circuits/lib/README.md
+++ b/ethereum/circuits/lib/README.md
@@ -209,7 +209,8 @@ struct TransactionWithinBlock<MAX_DATA_LEN> {
 ## U256
 
 U256 is a structure to use as a type for big numbers.  
-It is used when dealing with numbers up to 2<sup>256</sup>. They can exceed Field maximum value.
+It is used when dealing with numbers up to 2<sup>256</sup>. They can exceed Field maximum value.  
+In particular it is a word size in ETH and therefore it is a basic type used in both storage and slot values calculations.
 
 [There](.src/uint256.nr) is an unoptimized implementation of this type using two U128 structures. Optimized version will appear in Noir.