diff --git a/runbooks/oncall-rotation.md b/runbooks/oncall-rotation.md
index 7ea5dbc..e8aa8e0 100644
--- a/runbooks/oncall-rotation.md
+++ b/runbooks/oncall-rotation.md
@@ -3,3 +3,5 @@
 (Initial — see git history.)
 
 # update 2 (2026-04)
+
+# update 13 (2026-04)