diff --git a/.github/shipmill.toml b/.github/shipmill.toml
index c09c2ec..15e5f3d 100644
--- a/.github/shipmill.toml
+++ b/.github/shipmill.toml
@@ -14,6 +14,7 @@ after_stamp = ["uv lock --check"]
 [changelog]
 path = "CHANGELOG.md"
 style = "keep-a-changelog"
+fragments = "changelog.d"
 
 [bump]
 from = "headings"
@@ -93,3 +94,4 @@ remind_hours = 4   # repeat it while the session still waits
 max_wait_minutes = 15 # stop a session that waited this long; 0: never
 app_id = 5209412   # gated sessions write as shipmill-romamo[bot]
 mode = "headless" # nobody attaches: sessions ask on GitHub with needs-decision
+plugin_update = true
diff --git a/changelog.d/README.md b/changelog.d/README.md
new file mode 100644
index 0000000..f09a656
--- /dev/null
+++ b/changelog.d/README.md
@@ -0,0 +1,14 @@
+# Changelog fragments
+
+Each pull request adds its changelog entry here as its own file instead of editing
+`CHANGELOG.md`, so two pull requests never conflict on it. A stable release writes the
+fragments into its section of `CHANGELOG.md` and deletes them; this README stays.
+
+Name a fragment `<issue>-<slug>.md`, such as `changelog.d/244-merged-pr-head-landed.md`, and
+write what the pull request would have added under Unreleased, in the CHANGELOG's style:
+
+```markdown
+### Fixed
+
+- Worktrees: a branch whose tip was a merged PR's head landed (#244)
+```