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diff --git a/pod/perlfilter.pod b/pod/perlfilter.pod
index a2eb1d8..c3c8315 100644
--- a/pod/perlfilter.pod
+++ b/pod/perlfilter.pod
@@ -1,7 +1,7 @@
 =head1 NAME
 
 perlfilter - Source Filters
- 
+
 
 =head1 DESCRIPTION
 
@@ -19,12 +19,10 @@ you'll soon learn. But first, the basics.
 =head1 CONCEPTS
 
 Before the Perl interpreter can execute a Perl script, it must first
-read it from a file into memory for parsing and compilation. (Even
-scripts specified on the command line with the C<-e> option are stored in
-a temporary file for the parser to process.) If that script itself
-includes other scripts with a C<use> or C<require> statement, then each
-of those scripts will have to be read from their respective files as
-well.
+read it from a file into memory for parsing and compilation. If that
+script itself includes other scripts with a C<use> or C<require>
+statement, then each of those scripts will have to be read from their
+respective files as well.
 
 Now think of each logical connection between the Perl parser and an
 individual file as a I<source stream>. A source stream is created when
@@ -200,7 +198,7 @@ going to this trouble is when writing a source scrambler. The
 C<decrypt> filter (which unscrambles the source before Perl parses it)
 included with the source filter distribution is an example of a C
 source filter (see Decryption Filters, below).
- 
+
 
 =over 5
 
@@ -412,6 +410,7 @@ Here is the complete Debug filter:
     package Debug;
 
     use strict;
+    use warnings;
     use Filter::Util::Call ;
 
     use constant TRUE => 1 ;