Add a comment to describe what this script is for

diff --git a/utils/prepare-configfile.pl b/utils/prepare-configfile.pl
index e3b2b55..7156342 100755 (executable)
--- a/utils/prepare-configfile.pl
+++ b/utils/prepare-configfile.pl
@@ -1,5 +1,10 @@
 #!/usr/local/bin/perl
 
 #!/usr/local/bin/perl
 

+# This script is used by the config-file target in GNUMakefile.
+#
+# It removes garbage in the w3m output and separates comments
+# and active directives.
+

 use strict;
 use warnings;
 
 use strict;
 use warnings;