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Summary: Any CAST User Community extension (i.e. a custom extension) requires documentation that is freely available on the internet. CAST highly recommends using the CAST Extend Organisation in GitHub and creating a dedicated repository. This page describes the steps required to publish documentation in GitHub.


In order to publish your extension documentation, the following is required:

GitHub account

You need a GitHub account. If you already have an account you can use this, but if not you will need to create a new one - see https://github.com/join.

Please note:

  • the GitHub account must be a "public" account
  • the account you use to access the CAST Extend website is not linked to GitHub and therefore if you do not already have your own GitHub account you will need to create a new GitHub account specifically to edit and create the extension documentation. You can use the same credentials (login/password) that you use for the CAST Extend website, but this is not mandatory.

Membership of the CAST-Extend GitHub organization

You need to become a member of the CAST Extend organization. At the current time, please contact the GitHub user "CASTNDO" who will be able to add you to the organization. You will receive an email from GitHub (in the mailbox used for your GitHub account) containing a link which you need to click to confirm the membership.

You will also require "create new repository" privileges in the CAST Extend organization. If you cannot create a repository, please request this privilege.

Create a repository on GitHub

To create a new repository for your extension documentation: