diff --git a/script/derekovecs-server b/script/derekovecs-server
index 3531910..b09ffcf 100755
--- a/script/derekovecs-server
+++ b/script/derekovecs-server
@@ -1,7 +1,7 @@
 #!/usr/local/bin/perl
 our $VERSION = '0.90';
 
-use IDS::DeReKoVecs::Read qw(init_net load_sprofiles getCollocationAssociation getClassicCollocatorsCached getSimilarProfiles getSimilarProfilesCached getBiggestMergedDifferences filter_garbage get_neighbours getWordNumber);
+use IDS::DeReKoVecs::Read;
 use Mojolicious::Lite;
 use Mojo::JSON qw(decode_json encode_json to_json);
 use base 'Mojolicious::Plugin';
@@ -62,7 +62,20 @@
 my $title="";
 my $training_args="";
 
-getopts('d:D:Gil:p:m:n:M:C');
+getopts('d:D:Gil:p:m:n:M:C') or usage();
+
+sub usage() {
+  print STDERR <<EOF;
+non-server mode usage: MOJO_CONFIG=`pwd`/example.conf $0 [-h] [-d <file>]
+-h        : this (help) message
+-d file   : dump binary vecs as ascii text to <file>
+
+server-mode invocation:
+
+MOJO_CONFIG=`pwd`/example.conf morbo $0
+EOF
+  exit;
+}
 
 if($opt_M) {
   open my $handle, '<:encoding(UTF-8)', $opt_M