diff --git a/cr.pl b/rrclone.pl
similarity index 88%
rename from cr.pl
rename to rrclone.pl
index e37f7ef..ee8c481 100755
--- a/cr.pl
+++ b/rrclone.pl
@@ -1,6 +1,14 @@
 #!/usr/bin/perl
-# TODO: implement fool proof paths check (add trailing backslash if it absent on url and path)
 #
+# simple RPM Repository cloning script
+
+# looks like some toxic ditribution polices for ill-driven distros like debian|ubuntu or less shitty like centos
+# make maintainers split std. perl (and python too) distribution to many-many packages, even meta packages like
+# perl-modules for ubuntu contain not full set of default perl source distribution' modules, so you have to install
+# some packages in order to work with this script
+#
+# for ubuntu: libjson-pp-perl, libfile-spec-perl, libxml-parser-perl, libio-compress-perl, liburi-perl
+# for slackware - everything is bundled with builtin perl :)
 
 use strict;
 use warnings "all";
@@ -11,7 +19,7 @@ use File::Spec;
 use XML::Parser;
 use IO::Zlib;
 use URI::URL;
-use Data::Dumper;
+#use Data::Dumper;
 
 sub dlfunc(@);
 sub urlencode($);
@@ -19,6 +27,7 @@ sub getmetadata();
 sub help($);
 sub path_normalize_by_string_manipulation($);
 sub getfilenames($);
+sub noslash($);
 
 help(0) unless (defined $ARGV[0]);
 help(1) unless (defined $ARGV[1]);
@@ -41,6 +50,9 @@ if ($noclean == 1) {
 	$BASEDIR = $ARGV[2];
 }
 
+noslash($BASEURL);
+noslash($BASEDIR);
+
 my @REPOFILES;
 my @FILES;
 
@@ -303,4 +315,11 @@ sub getfilenames($) {
 
 }
 
+sub noslash($) {
+	my $str = shift;
+	return if ($str =~ /\/$/);
+	syswrite STDERR, "Source and destination must have trailing slashes!\n";
+	exit 1;
+}
+
 __END__