diff --git a/backends/github/file/README.md b/backends/github/file/README.md
index 12f9c84..525f685 100644
--- a/backends/github/file/README.md
+++ b/backends/github/file/README.md
@@ -13,6 +13,14 @@ Write & read data and upload files in GitHub repositories.
Note that if the branch name is not in the URL, Madata will try `main`, and then `master`.
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+
+The simplified URLs like `https://github.com/:owner/:repo/:path` could clash with the ones supported by the [GitHub Labels](../labels/) backend in the (unlikely) case the path starts from a directory called `issues`, `labels`, or `milestones`.
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+To avoid that, you can use one of the other URL formats or construct the backend object directly from the `GithubFile` class: `new GithubFile("https://github.com/leaverou/health-data/milestones/2024/labels").`
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+
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## Constructor options
* `allowForking`: Whether to fork on save if logged in user has no permission to push. Defaults to `false`.