A piece of high-quality software has good ways for its users to receive support. Some examples for ways to do that are:
A Mailing List.
IRC (Internet Relay Chats) Channels.
An email address for questions.
Web Forums.
Wikis.
Without good ways to receive support, users will be unnecessarily frustrated when they encounter a problem, which cannot be answered by the documentation. Refer to Joel Spolsky’s “Seven Steps to Remarkable Customer Service” for more information on how to give good support.