1 files changed, 3 insertions, 0 deletions
diff --git a/trace/control.h b/trace/control.h
index 0413b28769..27a16fc955 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -274,6 +274,9 @@ char *trace_opt_parse(const char *optarg);
  *
  * Re-synchronize initial event state with vCPUs (which can be created after
  * trace_init_events()).
+ *
+ * Precondition: event states won't be changed between trace_enable_events() and
+ * trace_init_vcpu_events() (e.g., through QMP).
  */
 void trace_init_vcpu_events(void);