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diff --git a/pod/perlrun.pod b/pod/perlrun.pod
index 138e344..7c56788 100644
--- a/pod/perlrun.pod
+++ b/pod/perlrun.pod
@@ -301,9 +301,11 @@ See L<perldebug>.
 sets debugging flags.  To watch how it executes your program, use
 B<-Dtls>.  (This works only if debugging is compiled into your
 Perl.)  Another nice value is B<-Dx>, which lists your compiled
-syntax tree.  And B<-Dr> displays compiled regular expressions. As an
-alternative, specify a number instead of list of letters (e.g., B<-D14> is
-equivalent to B<-Dtls>):
+syntax tree.  And B<-Dr> displays compiled regular expressions;
+the format of the output is explained in L<perldebguts>. 
+
+As an alternative, specify a number instead of list of letters (e.g.,
+B<-D14> is equivalent to B<-Dtls>):
 
         1  p  Tokenizing and parsing
         2  s  Stack snapshots
@@ -334,6 +336,9 @@ If you're just trying to get a print out of each line of Perl code
 as it executes, the way that C<sh -x> provides for shell scripts,
 you can't use Perl's B<-D> switch.  Instead do this 
 
+  # If you have "env" utility
+  env=PERLDB_OPTS="NonStop=1 AutoTrace=1 frame=2" perl -dS program
+
   # Bourne shell syntax
   $ PERLDB_OPTS="NonStop=1 AutoTrace=1 frame=2" perl -dS program