diff --git a/bin/OpenSimDefaults.ini b/bin/OpenSimDefaults.ini
index 1d2c0cff86..28c1db27e7 100644
--- a/bin/OpenSimDefaults.ini
+++ b/bin/OpenSimDefaults.ini
@@ -43,9 +43,14 @@
     ; Sets the method that OpenSim will use to fire asynchronous
     ; events. Valid values are UnsafeQueueUserWorkItem,
     ; QueueUserWorkItem, BeginInvoke, SmartThreadPool, and Thread.
+    ;
     ; SmartThreadPool is reported to work well on Mono/Linux, but
     ; UnsafeQueueUserWorkItem has been benchmarked with better
     ; performance on .NET/Windows
+    ;
+    ; UnsafeQueueUserWorkItem refers to the fact that the code creating the event could elevate its security 
+    ; privileges.  However, as calling code is trusted anyway this is safe (if you set
+    ;  TrustedBinaries = true in the [XEngine] section then you already have to trust that incoming code for other reasons).
     async_call_method = SmartThreadPool
 
     ; Max threads to allocate on the FireAndForget thread pool