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D15861.id38205.diff
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D15861.id38205.diff

diff --git a/src/docs/user/userguide/diffusion_uris.diviner b/src/docs/user/userguide/diffusion_uris.diviner
--- a/src/docs/user/userguide/diffusion_uris.diviner
+++ b/src/docs/user/userguide/diffusion_uris.diviner
@@ -23,9 +23,9 @@
repository. This will create a read-only copy of the repository in Phabricator.
**Mirror Repositories**: Phabricator can publish any repository to mirrors,
-updating the mirrors as changes are made to the repository. This works with
-both local hosted repositories and remote repositories that Phabricator is
-observing.
+overwiting them with an exact copy of the repository that stays up to date as
+the source changes. This works with both local repositories that Phabricator is
+hosting and remote repositories that Phabricator is observing.
**Proxy Repositories**: If you are observing a repository, you can allow users
to read Phabricator's copy of the repository. Phabricator supports granular
@@ -102,12 +102,19 @@
NOTE: Mirroring is not supported in Subversion.
You can create a read-only mirror of an existing repository. Phabricator will
-push all changes made to the repository to the mirror.
+continuously publish the state of the source repository to the mirror, creating
+an exact copy.
For example, if you have a repository hosted in Phabricator that you want to
mirror to GitHub, you can configure Phabricator to automatically maintain the
mirror. This is how the upstream repositories are set up.
+The mirror copy must be read-only for users because any writes made to the
+mirror will be undone when Phabricator updates it. The mirroring process copies
+the entire repository state exactly, so the remote state will be completely
+replaced with an exact copy of the source repository. This may remove or
+destroy information. Normally, you should only mirror to an empty repository.
+
You can mirror any repository, even if Phabricator is only observing it and not
hosting it directly.

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