--- IO-AIO/AIO.pm	2012/05/29 03:58:02	1.227
+++ IO-AIO/AIO.pm	2012/06/17 17:07:25	1.228
@@ -1910,7 +1910,8 @@
 =item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset]
 
 Memory-maps a file (or anonymous memory range) and attaches it to the
-given C<$scalar>, which will act like a string scalar.
+given C<$scalar>, which will act like a string scalar. Returns true on
+success, and false otherwise.
 
 The only operations allowed on the scalar are C<substr>/C<vec> that don't
 change the string length, and most read-only operations such as copying it