diff --git a/doc/NOTES b/doc/NOTES
index 2b2212e..cc80d04 100644
--- a/doc/NOTES
+++ b/doc/NOTES
@@ -16,3 +16,9 @@ The read event demultiplexer
 
     Buffer may be discarded upon next ax25_read() event, but should not
     be discarded after an ax25_select() necessarily.
+
+Most crucially: This sequence of events is triggered by ANY of the I/O calls,
+so as to facilitate the same sort of behaviors that one would expect when
+letting a kernel thread be responsible for all this activity from a userland
+process' perspective.  The main difference in behavior in any of these calls is
+the result provided to the caller.