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diff --git a/control-spec.txt b/control-spec.txt
index ac6578a..97bee17 100644
--- a/control-spec.txt
+++ b/control-spec.txt
@@ -2267,6 +2267,14 @@
Severity = "DEBUG" / "INFO" / "NOTICE" / "WARN"/ "ERR"
+ Some low-level logs may be sent from signal handlers, so their destination
+ logs must be signal-safe. These low-level logs include backtraces,
+ logging function errors, and errors in code called by logging functions.
+ Signal-safe logs are never sent as control port log events.
+
+ Control port message trace debug logs are never sent as control port log
+ events, to avoid modifying control output when debugging.
+
4.1.6. New descriptors available
This event is generated when new router descriptors (not microdescs or