diff --git a/runbooks/grafana-dashboard.md b/runbooks/grafana-dashboard.md
index 497007a..bcb4b62 100644
--- a/runbooks/grafana-dashboard.md
+++ b/runbooks/grafana-dashboard.md
@@ -1,3 +1,5 @@
 # internal-docs — grafana-dashboard
 
 (Initial — see git history.)
+
+# update 1 (2026-04)