> For the complete documentation index, see [llms.txt](https://happybara.gitbook.io/channitor/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://happybara.gitbook.io/channitor/reference/joining-behavior.md).

# Joining Behavior

### Channitor can be configured to join new public channels by default, or require approval.  

* **New channel setting**

  > Change the behavior of Channitor towards newly created channels. Options available:
  >
  > * `Auto` Join every new channel automatically.
  > * `Manual` Ask in the newly created channel whether it should join. Waits for team member to respond.

#### The number of zero-activity days before a channel expires and archiving is prompted can also be modified.

* **Expiration threshold**

  > The number of days a channel can go without activity before Channitor starts sending reminders
  >
  > * The setting in the `Joining Behavior` section only applies to channels joined in the future.
  > * Use the select menu at the top of the [`Watched Channels`](/channitor/reference/watched-channels.md) section to adjust settings for specific channels.

#### Specific channels can be joined in bulk using the section menu in this section.  Options to join all channels and remove Channitor from all channels are also available.

![](/files/-MCJu0kKa9oQyVnEEi4h)

### Channels:Users (C/U) Ratio <a href="#cu-ratio" id="cu-ratio"></a>

This is the number of public channels divided by the number of users across your workspace.  It's a good measure of how fragmented your information is in Slack.  The sweet spot varies for every team, but **3-5** is a good place to be.

{% hint style="info" %}
**All public channels** are included in the C/U ratio calculation, regardless of whether Channitor has joined them or not.
{% endhint %}