How to update a soundset from 3.0 to 3.1

This document describes how to convert freeciv 3.0 compatible soundset to freeciv 3.1 compatible ones.
==Capability==
Capability string of soundspec file must be changed.
[soundspec]
options = "+Freeciv-3.1-soundset"
==New event tags==
For the new events, new event sound tags can be added if the soundset aims to be complete. New tags added in freeciv-3.1 are e_hut_map, e_unit_action_actor_success, e_unit_action_actor_failure, e_unit_action_target_hostile, e_unit_action_target_other, and e_infrapoints.