Changing access permissions for wikis
Only repository collaborators can edit a public repository's wiki by default, but you can allow anyone with a GitHub Enterprise to edit your wiki.
Wikis are available in public repositories with GitHub Free, and in public and private repositories with GitHub Pro, GitHub Team, GitHub Enterprise Cloud, and GitHub Enterprise Server.
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On GitHub Enterprise, navigate to the main page of the repository.
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Under your repository name, click Settings.
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Under Features, unselect Restrict edits to collaborators only.
