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diff --git a/pod/perlvar.pod b/pod/perlvar.pod
index dd9bbaa..258645e 100644
--- a/pod/perlvar.pod
+++ b/pod/perlvar.pod
@@ -769,6 +769,12 @@ The process number of the Perl running this script.  You should
 consider this variable read-only, although it will be altered
 across fork() calls.  (Mnemonic: same as shells.)
 
+Note for Linux users: on Linux, the C functions C<getpid()> and
+C<getppid()> return different values from different threads. In order to
+be portable, this behavior is not reflected by C<$$>, whose value remains
+consistent across threads. If you want to call the underlying C<getpid()>,
+you may use the CPAN module C<Linux::Pid>.
+
 =item $REAL_USER_ID
 
 =item $UID
@@ -1004,16 +1010,16 @@ is identical to C<$Config{'osname'}>.  See also L<Config> and the
 B<-V> command-line switch documented in L<perlrun>.
 
 In Windows platforms, $^O is not very helpful: since it is always
-C<MSWin32>, it doesn't tell the difference between 95/98/ME/NT/2000/XP/CE.
-Use Win32::GetOSVersion() (see L<perlport>) and other means (like for
-example the presence/absence of some files) to distinguish between
-the variants.
+C<MSWin32>, it doesn't tell the difference between
+95/98/ME/NT/2000/XP/CE/.NET.  Use Win32::GetOSName() or
+Win32::GetOSVersion() (see L<Win32> and L<perlport>) to distinguish
+between the variants.
 
 =item ${^OPEN}
 
 An internal variable used by PerlIO.  A string in two parts, separated
-by a C<\0> byte, the first part is the input disciplines, the second
-part is the output disciplines.
+by a C<\0> byte, the first part describes the input layers, the second
+part describes the output layers.
 
 =item $PERLDB
 
@@ -1225,6 +1231,13 @@ the script.  C<$#ARGV> is generally the number of arguments minus
 one, because C<$ARGV[0]> is the first argument, I<not> the program's
 command name itself.  See C<$0> for the command name.
 
+=item ARGVOUT
+
+The special filehandle that points to the currently open output file
+when doing edit-in-place processing with B<-i>.  Useful when you have
+to do a lot of inserting and don't want to keep modifying $_.  See
+L<perlrun> for the B<-i> switch.
+
 =item @F
 
 The array @F contains the fields of each line read in when autosplit
@@ -1460,8 +1473,9 @@ used safely in programs.  C<$^_> itself, however, I<is> reserved.
 
 Perl identifiers that begin with digits, control characters, or
 punctuation characters are exempt from the effects of the C<package>
-declaration and are always forced to be in package C<main>.  A few
-other names are also exempt:
+declaration and are always forced to be in package C<main>; they are
+also exempt from C<strict 'vars'> errors.  A few other names are also
+exempt in these ways:
 
 	ENV		STDIN
 	INC		STDOUT
@@ -1471,7 +1485,7 @@ other names are also exempt:
 
 In particular, the new special C<${^_XYZ}> variables are always taken
 to be in package C<main>, regardless of any C<package> declarations
-presently in scope.
+presently in scope.  
 
 =head1 BUGS