diff --git a/ImageManager/ThumbnailCache.h b/ImageManager/ThumbnailCache.h
index cb73159d..d1eafa44 100644
--- a/ImageManager/ThumbnailCache.h
+++ b/ImageManager/ThumbnailCache.h
@@ -1,96 +1,103 @@
 /* Copyright (C) 2003-2020 Jesper K. Pedersen <blackie@kde.org>
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This program 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
    General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; see the file COPYING.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
 */
 #ifndef THUMBNAILCACHE_H
 #define THUMBNAILCACHE_H
 #include "CacheFileInfo.h"
 
 #include <DB/FileNameList.h>
 
 #include <QFile>
 #include <QHash>
 #include <QImage>
 #include <QMutex>
 
 template <class Key, class T>
 class QCache;
 
 namespace ImageManager
 {
 
 class ThumbnailMapping;
 
 class ThumbnailCache : public QObject
 {
     Q_OBJECT
 
 public:
     static ThumbnailCache *instance();
     static void deleteInstance();
     ThumbnailCache(const QString &baseDirectory);
     void insert(const DB::FileName &name, const QImage &image);
     QPixmap lookup(const DB::FileName &name) const;
     QByteArray lookupRawData(const DB::FileName &name) const;
     bool contains(const DB::FileName &name) const;
-    void load();
     void removeThumbnail(const DB::FileName &);
     void removeThumbnails(const DB::FileNameList &);
 
 public slots:
     void save() const;
     void flush();
 
 signals:
     void doSave() const;
 
 private:
+    /**
+     * @brief load the \c thumbnailindex file if possible.
+     * This function populates the thumbnail hash, but does not
+     * load any actual thumbnail data.
+     * If the file does not exist, or if it is not compatible,
+     * then it is discarded.
+     */
+    void load();
     ~ThumbnailCache() override;
     QString fileNameForIndex(int index) const;
     QString thumbnailPath(const QString &fileName) const;
 
     static ThumbnailCache *s_instance;
     const QString m_baseDir;
     QHash<DB::FileName, CacheFileInfo> m_hash;
     mutable QHash<DB::FileName, CacheFileInfo> m_unsavedHash;
     /* Protects accesses to the data (hash and unsaved hash) */
     mutable QMutex m_dataLock;
     /* Prevents multiple saves from happening simultaneously */
     mutable QMutex m_saveLock;
     /* Protects writing thumbnails to disk */
     mutable QMutex m_thumbnailWriterLock;
     int m_currentFile;
     int m_currentOffset;
     mutable QTimer *m_timer;
     mutable bool m_needsFullSave;
     mutable bool m_isDirty;
     void saveFull() const;
     void saveIncremental() const;
     void saveInternal() const;
     void saveImpl() const;
 
     /**
      * Holds an in-memory cache of thumbnail files.
      */
     mutable QCache<int, ThumbnailMapping> *m_memcache;
     mutable QFile *m_currentWriter;
 };
 
 }
 
 #endif /* THUMBNAILCACHE_H */
 
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