diff --git a/skills/kvb-release-changelog/SKILL.md b/skills/kvb-release-changelog/SKILL.md
index e9a5bfa..64cc267 100644
--- a/skills/kvb-release-changelog/SKILL.md
+++ b/skills/kvb-release-changelog/SKILL.md
@@ -6,7 +6,7 @@ description: >
   markdown-lint rejection.
 ---
 
-Read `reasons.md` next to this file when a rule seems not to fit or a lint
+Read `reasons.md` next to this file when a rule does not fit or a lint
 finding is unclear, and `special.md` for: no tag, a failed previous-tag
 workflow, a test- or CI-only release, no `markdownlint-cli2`, a pasted pkgmgr
 rejection.
@@ -35,8 +35,9 @@ git log --no-merges --format='%h %s%n%b' <tag>..HEAD
 Fixed. `!` or `BREAKING CHANGE:`: Breaking, plus one Upgrade notes line per
 required action. `docs`, `style`, `refactor`, `test`, `ci`, `build`,
 `chore`: omitted unless a user sees the effect. Dependency bumps: one
-collapsed line, or omitted. Order: Breaking, Added, Changed, Fixed, Upgrade
-notes; empty sections left out.
+line, or omitted. Order: Breaking, Added, Changed, Fixed, Version
+jumps, Upgrade notes, Contributors (always, with URLs: `sections.md`);
+empty sections left out.
 
 ## 3. Format
 
@@ -44,7 +45,7 @@ notes; empty sections left out.
    bold-only lines.
 2. No version heading, date or "Release X.Y.Z" line.
 3. One bullet, one line: too long means shorter, never wrapped.
-4. Line length: the repository's MD013 limit (markdownlint's default 80);
+4. Line length: the repository's MD013 limit (default 80);
    aim for 78 or less.
 5. Lists: no nesting, a blank line before and after (MD004, MD032), the
    marker of the existing CHANGELOG.md's first list item; `-` without a
diff --git a/skills/kvb-release-changelog/sections.md b/skills/kvb-release-changelog/sections.md
new file mode 100644
index 0000000..0d817ec
--- /dev/null
+++ b/skills/kvb-release-changelog/sections.md
@@ -0,0 +1,63 @@
+# Version jumps, Contributors and net counting
+
+## Net, not per commit
+
+After a long-lived branch merges, `git log <tag>..HEAD` lists commits that
+were already released under other SHAs (v16.2.3..main held 2430 commits; the
+Wazuh role shipped in 16.1.0 and reappeared through the store-i18n merge).
+Judge every Added, Changed and Fixed line against `git diff <tag>..HEAD` and
+the earlier CHANGELOG.md entries, never against the commit list alone.
+
+## Version jumps (net since X.Y.Z)
+
+Only in a repository that pins a version per role
+(`roles/*/meta/services.yml`): one `- *role*: old to new` line per role whose
+pinned version differs between the tag and HEAD:
+
+```bash
+git diff <tag>..HEAD -- 'roles/*/meta/services.yml'
+```
+
+Compare the `version` field of every entity in each file at both refs: a
+version bumped twice shows once, one changed and changed back not at all.
+The same comparison covers every other pin:
+
+- `ref` and `*_version` keys beside `version` (a pkgmgr `ref`, a
+  `webui_version`, a `builder_version`).
+- Add-on pins in `roles/*/meta/addons/*.yml`.
+- Renamed or split roles: pair the old and the new role (`git diff -M
+  --name-status <tag>..HEAD -- roles/`) before comparing, else the jump
+  hides behind the rename. A rename without an alias is also a Breaking
+  line plus an Upgrade note.
+- Manifests outside the roles: `requirements/requirements.galaxy.yml`
+  collections and the `pyproject.toml` pins.
+
+A change that is no version bump (an image swapped for a source build, a
+base like `cpu` becoming `22.04`, `2026.8.0` becoming `3.13`) needs
+judgement: a Changed line or an Upgrade note, never a jump line.
+
+## Contributors
+
+Always, one `- [Name](URL): areas` line per human author and
+`Co-authored-by` trailer in the range, the areas taken from that person's
+commits:
+
+```bash
+git log --format='%aN%n%(trailers:key=Co-authored-by,valueonly)' <tag>..HEAD
+git check-mailmap '<Name> <email>'
+```
+
+- Names go through `.mailmap`, so one person shows once.
+- Bots stay out: dependabot, updaters, github-actions, Claude and other AI
+  co-authors.
+- The URL comes from earlier entries (CHANGELOG.md,
+  `packaging/debian/changelog`); `.mailmap` holds none. A person without one
+  there is asked for, never left without a URL.
+
+Example:
+
+```text
+Contributors:
+
+- [Kevin Veen-Birkenbach](https://veen.world): PHP hardening, Node.js
+```