diff --git a/messageviewer/src/dkim-verify/dkimcheckauthenticationstatusjob.cpp b/messageviewer/src/dkim-verify/dkimcheckauthenticationstatusjob.cpp
index 3d008613..13d3b7d1 100644
--- a/messageviewer/src/dkim-verify/dkimcheckauthenticationstatusjob.cpp
+++ b/messageviewer/src/dkim-verify/dkimcheckauthenticationstatusjob.cpp
@@ -1,76 +1,76 @@
 /*
    Copyright (C) 2018-2019 Laurent Montel <montel@kde.org>
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
 */
 
 #include "dkimcheckauthenticationstatusjob.h"
 #include "messageviewer_dkimcheckerdebug.h"
 using namespace MessageViewer;
-
+//see https://tools.ietf.org/html/rfc7601
 DKIMCheckAuthenticationStatusJob::DKIMCheckAuthenticationStatusJob(QObject *parent)
     : QObject(parent)
 {
 }
 
 DKIMCheckAuthenticationStatusJob::~DKIMCheckAuthenticationStatusJob()
 {
 }
 
 void DKIMCheckAuthenticationStatusJob::start()
 {
     if (!canStart()) {
         qCWarning(MESSAGEVIEWER_DKIMCHECKER_LOG) << "Impossible to start job";
         deleteLater();
         return;
     }
     if (auto hrd = mMessage->headerByType("Authentication-Results")) {
         mAuthenticationResult = hrd->asUnicodeString();
     }
     if (mAuthenticationResult.isEmpty()) {
         qCWarning(MESSAGEVIEWER_DKIMCHECKER_LOG) << "Authentication result is empty";
         deleteLater();
         return;
     }
     //TODO
     deleteLater();
 }
 
 bool DKIMCheckAuthenticationStatusJob::canStart() const
 {
     //TODO
     return mMessage != nullptr;
 }
 
 KMime::Message::Ptr DKIMCheckAuthenticationStatusJob::message() const
 {
     return mMessage;
 }
 
 void DKIMCheckAuthenticationStatusJob::setMessage(const KMime::Message::Ptr &message)
 {
     mMessage = message;
 }
 
 QString DKIMCheckAuthenticationStatusJob::authenticationResult() const
 {
     return mAuthenticationResult;
 }
 
 void DKIMCheckAuthenticationStatusJob::setAuthenticationResult(const QString &authenticationResult)
 {
     mAuthenticationResult = authenticationResult;
 }