Slack.Web.Groups.set_topic

You're seeing just the function set_topic, go back to Slack.Web.Groups module for more information.

set_topic(channel, topic, optional_params \\ %{})

Sets the topic for a private channel.

Required Params

channel - Private channel to set the topic of
topic - The new topic ex: My Topic

Errors the API can return:

channel_not_found - Value passed for channel was invalid.
is_archived - Private group has been archived
too_long - Topic was longer than 250 characters.
user_is_restricted - Setting the topic is a restricted action.