diff --git a/changelog/unreleased/issue-2089 b/changelog/unreleased/issue-2089
new file mode 100644
index 000000000..d867c4fa4
--- /dev/null
+++ b/changelog/unreleased/issue-2089
@@ -0,0 +1,9 @@
+Enhancement: increase granularity of the "keep within" retention policy
+
+The `keep-within` option of the `forget` command now accepts time ranges with
+an hourly granularity. For example, running `restic forget --keep-within 3d12h`
+will keep all the snapshots made within three days and twelve hours from the
+time of the latest snapshot.
+
+https://github.com/restic/restic/issues/2089
+https://github.com/restic/restic/pull/2090
diff --git a/doc/060_forget.rst b/doc/060_forget.rst
index 7222c1711..a1edc55fc 100644
--- a/doc/060_forget.rst
+++ b/doc/060_forget.rst
@@ -168,8 +168,9 @@ The ``forget`` command accepts the following parameters:
    this option (can be specified multiple times).
 -  ``--keep-within duration`` keep all snapshots which have been made within
    the duration of the latest snapshot. ``duration`` needs to be a number of
-   years, months, and days, e.g. ``2y5m7d`` will keep all snapshots made in the
-   two years, five months, and seven days before the latest snapshot.
+   years, months, days, and hours, e.g. ``2y5m7d3h`` will keep all snapshots
+   made in the two years, five months, seven days, and three hours before the
+   latest snapshot.
 
 Multiple policies will be ORed together so as to be as inclusive as possible
 for keeping snapshots.