diff --git a/perl/benchmark/p1.pl b/perl/benchmark/serialize.pl
similarity index 73%
rename from perl/benchmark/p1.pl
rename to perl/benchmark/serialize.pl
index 257932e..626ae03 100644
--- a/perl/benchmark/p1.pl
+++ b/perl/benchmark/serialize.pl
@@ -7,6 +7,8 @@ use Benchmark ':all';
 my $a = [0..2**24];
 
 print "-- serialize\n";
+print "JSON::XS: $JSON::XS::VERSION\n";
+print "Data::MessagePack: $Data::MessagePack::VERSION\n";
 cmpthese(
     -1 => {
         json => sub { JSON::XS::encode_json($a)   },