diff --git a/changelog/unreleased/issue-3295 b/changelog/unreleased/issue-3295
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+Change: Deprecate `check --check-unused` and add further checks
+
+Since restic 0.12.0, it is expected to still have unused blobs after running
+`prune`. This made the `check --check-unused` rather useless and tended to
+confuse users. The options has been deprecated and is now ignored.
+
+`check` now also warns if a repository is using either the legacy S3 layout or
+mixed pack files with both tree and data blobs. The latter is known to cause
+performance problems.
+
+https://github.com/restic/restic/issues/3295
+https://github.com/restic/restic/pull/3730