diff --git a/changelog/unreleased/pull-4006 b/changelog/unreleased/pull-4006
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+Enhancement: (alpha) Store deviceID only for hardlinks
+
+Set `RESTIC_FEATURES=device-id-for-hardlinks` to enable this alpha feature.
+The feature flag will be removed after repository format version 3 becomes
+available or be replaced with a different solution.
+
+When creating backups from a filesystem snapshot, for example created using
+btrfs subvolumes, the deviceID of the filesystem changes compared to previous
+snapshots. This prevented restic from deduplicating the directory metadata of
+a snapshot.
+
+When this alpha feature is enabled, then the deviceID is only stored for
+hardlinks. This significantly reduces the metadata duplication for most
+backups.
+
+https://github.com/restic/restic/pull/4006