[patch] perlhack.pod

[p5sagit/p5-mst-13.2.git] / pod / perliol.pod

diff --git a/pod/perliol.pod b/pod/perliol.pod
index 466959b..3798a97 100644 (file)
--- a/pod/perliol.pod
+++ b/pod/perliol.pod
@@ -22,7 +22,7 @@ maintain (source) compatibility.
 
 The aim of the implementation is to provide the PerlIO API in a flexible
 and platform neutral manner. It is also a trial of an "Object Oriented
-C, with vtables" approach which may be applied to perl6.
+C, with vtables" approach which may be applied to Perl 6.
 
 =head2 Basic Structure
 
@@ -559,6 +559,10 @@ pushed. e.g. ":encoding(ascii)" would return an SvPV with value
 "ascii". (I<param> and I<flags> arguments can be ignored in most
 cases)
 
+C<Dup> uses C<Getarg> to retrieve the argument originally passed to
+C<Pushed>, so you must implement this function if your layer has an
+extra argument to C<Pushed> and will ever be C<Dup>ed.
+
 =item Fileno
 
        IV        (*Fileno)(pTHX_ PerlIO *f);