--- EV/EV.pm	2010/03/28 15:48:21	1.127
+++ EV/EV.pm	2010/10/21 02:46:59	1.128
@@ -952,7 +952,7 @@
 Call the callback just after the process wakes up again (after it has
 gathered events), but before any other callbacks have been invoked.
 
-This is used to integrate other event-based software into the EV
+This can be used to integrate other event-based software into the EV
 mainloop: You register a prepare callback and in there, you create io and
 timer watchers as required by the other software. Here is a real-world
 example of integrating Net::SNMP (with some details left out):
@@ -997,6 +997,16 @@
 
 The C<check_ns> variant doesn't start (activate) the newly created watcher.
 
+=item EV::CHECK constant issues
+
+Like all other watcher types, there is a bitmask constant for use in
+C<$revents> and other places. The C<EV::CHECK> is special as it has
+the same name as the C<CHECK> sub called by Perl. This doesn't cause
+big issues on newer perls (beginning with 5.8.9), but it means thatthe
+constant must be I<inlined>, i.e. runtime calls will not work. That means
+that as long as you always C<use EV> and then C<EV::CHECK> you are on the
+safe side.
+
 =back