diff --git a/fixture.md b/fixture.md
index bb117c8..eca1fef 100644
--- a/fixture.md
+++ b/fixture.md
@@ -11,3 +11,5 @@ Arm B branch-message trailer:
 Absence controls (must not appear in the landed squash object):
 - `Co-authored-by: absent-arm-a <absent-arm-a@example.invalid>`
 - `Reviewed-by: absent-arm-b <absent-arm-b@example.invalid>`
+
+Foreign-authored branch change for linked-author generation.