diff --git a/adr/0003-monitoring-stack.md b/adr/0003-monitoring-stack.md
index a040811..802fa8f 100644
--- a/adr/0003-monitoring-stack.md
+++ b/adr/0003-monitoring-stack.md
@@ -3,3 +3,5 @@
 (Initial — see git history.)
 
 # update 7 (2026-04)
+
+# update 18 (2026-04)