From 474debb79cda85816c4afb4b6a8e8fcd6966d4c8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=BC=82=E6=B5=81?= <driftluo@foxmail.com>
Date: Wed, 20 Sep 2023 23:13:19 +0800
Subject: [PATCH] Update protocol/src/types/block.rs

Co-authored-by: Flouse <1297478+Flouse@users.noreply.github.com>
---
 protocol/src/types/block.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/protocol/src/types/block.rs b/protocol/src/types/block.rs
index b4b4adc9a..ab1236dbe 100644
--- a/protocol/src/types/block.rs
+++ b/protocol/src/types/block.rs
@@ -219,6 +219,9 @@ pub struct Header {
     pub number:                   BlockNumber,
     pub gas_used:                 U256,
     pub gas_limit:                U256,
+    /// Extra data for the block header
+    /// The first index of extra_data is used to store hardfork information:
+    /// `HardforkInfoInner`
     pub extra_data:               Vec<ExtraData>,
     pub base_fee_per_gas:         U256,
     pub proof:                    Proof,