Document _ prototype in perlsub

p4raw-id: //depot/perl@29038

1 files changed, 4 insertions, 1 deletions

diff --git a/pod/perlsub.pod b/pod/perlsub.pod
index 4c7dcd6209..47ea666fc2 100644
--- a/pod/perlsub.pod
+++ b/pod/perlsub.pod
@@ -1098,9 +1098,12 @@ follows:
 	...
     }
 
-A semicolon separates mandatory arguments from optional arguments.
+A semicolon (C<;>) separates mandatory arguments from optional arguments.
 It is redundant before C<@> or C<%>, which gobble up everything else.
 
+As the last character of a prototype, you can use C<_> in place of C<$>:
+if this argument is not provided, C<$_> will be used instead.
+
 Note how the last three examples in the table above are treated
 specially by the parser.  C<mygrep()> is parsed as a true list
 operator, C<myrand()> is parsed as a true unary operator with unary