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diff --git a/pod/perlfilter.pod b/pod/perlfilter.pod
index d5fae92..c3c8315 100644
--- a/pod/perlfilter.pod
+++ b/pod/perlfilter.pod
@@ -1,7 +1,7 @@
 =head1 NAME
 
 perlfilter - Source Filters
- 
+
 
 =head1 DESCRIPTION
 
@@ -198,7 +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
 
@@ -410,6 +410,7 @@ Here is the complete Debug filter:
     package Debug;
 
     use strict;
+    use warnings;
     use Filter::Util::Call ;
 
     use constant TRUE => 1 ;