fix filename size, add comment
fix filename size, add comment

Signed-off-by: Greta Doci <9a2413ca1cbc98a3d95fc4d94b0952e5a7369afd@gmail.com>

andreas-p/nextcloud-server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,nextcloud/server,nextcloud/server,andreas-p/nextcloud-server,nextcloud/server