diff --git a/pep-0669.rst b/pep-0669.rst
index 66faf0cce..8648da333 100644
--- a/pep-0669.rst
+++ b/pep-0669.rst
@@ -206,6 +206,7 @@ Events can be controlled globally by modifying the set of events being monitored
 
 * ``sys.monitoring.set_events(tool_id:int, event_set: int)``
   Activates all events which are set in ``event_set``.
+  Raises a ``ValueError`` if ``tool_id`` is not in use.
 
 No events are active by default.
 
@@ -219,6 +220,7 @@ Events can also be controlled on a per code object basis:
 
 * ``sys.monitoring.set_local_events(tool_id:int, code: CodeType, event_set: int)``
   Activates all the local events for ``code``  which are set in ``event_set``.
+  Raises a ``ValueError`` if ``tool_id`` is not in use.
 
 Local events add to global events, but do not mask them.
 In other words, all global events will trigger for a code object,
@@ -307,8 +309,8 @@ Order of events
 
 If an instructions triggers several events they occur in the following order:
 
-* INSTRUCTION
 * LINE
+* INSTRUCTION
 * All other events (only one of these events can occur per instruction)
 
 Each event is delivered to tools in ascending order of ID.