diff --git a/examples/collector.yaml b/examples/collector.yaml
index 3b10651..1354d29 100644
--- a/examples/collector.yaml
+++ b/examples/collector.yaml
@@ -48,4 +48,8 @@ sources:
   # Valid → emit + delete. Invalid → moved to .dead-letter/ with reason.
   drop_folder:
     path: ~/Nyx/workspace/incoming/
-    poll_fallback_seconds: 30   # safety net if inotify misses
+    # Safety net if inotify misses an event. 0 (or unset) = use the
+    # 30-second default. There is no "disable polling" option in v1 —
+    # if you don't want polling, leave inotify to do its job and ignore
+    # the cost (a periodic readdir is microseconds).
+    poll_fallback_seconds: 30
diff --git a/internal/inbox/inbox.go b/internal/inbox/inbox.go
index 54ee0f5..c687c95 100644
--- a/internal/inbox/inbox.go
+++ b/internal/inbox/inbox.go
@@ -38,6 +38,11 @@ type Event struct {
 //
 // Concurrency: a single Writer is safe for use from multiple goroutines.
 // One sync.Mutex per recipient bounds contention to per-file granularity.
+//
+// The locks map grows monotonically as new recipients appear. In practice
+// the agent network has <10 recipients, so the leak is bounded; if this
+// daemon ever lives in a system with thousands of recipients, replace the
+// map with an LRU or shard-and-evict scheme.
 type Writer struct {
 	dir string