1 files changed, 72 insertions, 0 deletions
diff --git a/pod/perlintern.pod b/pod/perlintern.pod
index 6af18b507c..8bfe5a3cd3 100644
--- a/pod/perlintern.pod
+++ b/pod/perlintern.pod
@@ -46,6 +46,78 @@ True if this op will be the return value of an lvalue subroutine
 =for hackers
 Found in file pp.h
 
+=item PL_DBsingle
+
+When Perl is run in debugging mode, with the B<-d> switch, this SV is a
+boolean which indicates whether subs are being single-stepped.
+Single-stepping is automatically turned on after every step.  This is the C
+variable which corresponds to Perl's $DB::single variable.  See
+C<PL_DBsub>.
+
+	SV *	PL_DBsingle
+
+=for hackers
+Found in file intrpvar.h
+
+=item PL_DBsub
+
+When Perl is run in debugging mode, with the B<-d> switch, this GV contains
+the SV which holds the name of the sub being debugged.  This is the C
+variable which corresponds to Perl's $DB::sub variable.  See
+C<PL_DBsingle>.
+
+	GV *	PL_DBsub
+
+=for hackers
+Found in file intrpvar.h
+
+=item PL_DBtrace
+
+Trace variable used when Perl is run in debugging mode, with the B<-d>
+switch.  This is the C variable which corresponds to Perl's $DB::trace
+variable.  See C<PL_DBsingle>.
+
+	SV *	PL_DBtrace
+
+=for hackers
+Found in file intrpvar.h
+
+=item PL_dowarn
+
+The C variable which corresponds to Perl's $^W warning variable.
+
+	bool	PL_dowarn
+
+=for hackers
+Found in file intrpvar.h
+
+=item PL_last_in_gv
+
+The GV which was last used for a filehandle input operation. (C<< <FH> >>)
+
+	GV*	PL_last_in_gv
+
+=for hackers
+Found in file thrdvar.h
+
+=item PL_ofs_sv
+
+The output field separator - C<$,> in Perl space.
+
+	SV*	PL_ofs_sv
+
+=for hackers
+Found in file thrdvar.h
+
+=item PL_rs
+
+The input record separator - C<$/> in Perl space.
+
+	SV*	PL_rs
+
+=for hackers
+Found in file thrdvar.h
+
 =item start_glob
 
 Function called by C<do_readline> to spawn a glob (or do the glob inside