diff --git a/doc/release-notes.md b/doc/release-notes.md
index 471445bd7..bf2c6b342 100644
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -1,7 +1,9 @@
# Bitcoin ABC 0.26.6 Release Notes
Bitcoin ABC version 0.26.6 is now available from:
-This is a maintenance release with no user-visible change.
+This release includes the following features and fixes:
+ - The `getblock` RPC verbose mode level 2 now returns the transactions fees if
+ undo data is available. See the RPC documentation for more details.
diff --git a/src/core_io.h b/src/core_io.h
index 4d526af93..0430d8f35 100644
--- a/src/core_io.h
+++ b/src/core_io.h
@@ -1,56 +1,57 @@
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_CORE_IO_H
#define BITCOIN_CORE_IO_H
#include
#include