diff --git a/2018-06-wikidata-volleyball-players/README.md b/2018-06-wikidata-volleyball-players/README.md
index 992bac4..1fd7b5b 100644
--- a/2018-06-wikidata-volleyball-players/README.md
+++ b/2018-06-wikidata-volleyball-players/README.md
@@ -1,20 +1,20 @@
 # 2018 Wikidata volleyball players importer bot
 
 This PHP bot was developed to import LegaVolley volleyball players in Wikidata.
 
 ## Consensus
 * [Bot consensus for Wikidata](https://www.wikidata.org/wiki/Wikidata:Requests_for_permissions/Bot/Valerio_Bozzolan_bot_6)
 
 ## Usage
 
-    ./bot.php
+    ./bot.php file.csv
 
 ## License
 
 Copyright (C) 2018, 2019, 2020 Valerio Bozzolan
 
 This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
 
 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
diff --git a/2018-06-wikidata-volleyball-players/bot.php b/2018-06-wikidata-volleyball-players/bot.php
index cbae2d8..cd7c20e 100755
--- a/2018-06-wikidata-volleyball-players/bot.php
+++ b/2018-06-wikidata-volleyball-players/bot.php
@@ -1,304 +1,361 @@
 #!/usr/bin/php
 <?php
 /*****************************
  * Legavolley 2018 importer *
  *                           *
  * @author Valerio Bozzolan  *
  * @license GNU GPL v3+      *
  *****************************/
 
 define( 'SUMMARY', 'Bot: [[Wikidata:Requests for permissions/Bot/Valerio Bozzolan bot 6|importing volleyball players from LegaVolley]]' );
 
 // load boz-mw
 require 'includes/boz-mw/autoload.php';
 
 use cli\Log;
 use cli\ConfigWizard;
 use cli\Opts;
 use cli\ParamValuedLong;
+use cli\ParamFlag;
 use cli\ParamFlagLong;
 use wb\References;
 use wb\Reference;
 use wb\SnakItem;
 use wb\StatementItem;
 
 // load configuration file or create one
 ConfigWizard::requireOrCreate( __DIR__ . '/../config.php' );
 
 // load options
 $opts = new Opts( [
 	new ParamValuedLong( 'start-qid', "start from this Wikidata Q ID" ),
-	new ParamFlagLong(   'always',    "save without confirmation" ),
+	new ParamFlagLong(  'always',    "save without confirmation" ),
+	new ParamFlag(      'help', 'h', "show this help and quit" ),
 ] );
 
+// check if you loaded the help message
+if( $opts->getArg( 'help' ) ) {
+	help();
+}
+
 // starting QID
 $start_from_qid = $opts->getArg( 'start-qid' );
 
+// input CSV path name
+$input_csv = Opts::unnamedArguments()[0] ?? null;
+if( !$input_csv ) {
+	help( "please specify a CSV file" );
+}
+
 // check if you want to save without confirmation
 $ALWAYS = $opts->getArg( 'always' );
 
 // COUNTRIES
 $COUNTRIES = [];
-$handle = fopen( 'data/volleyball-nationalities.csv', 'r' ) or die( 'cannot open nationalities' );
+$handle = @fopen( 'data/volleyball-nationalities.csv', 'r' );
+if( !$handle ) {
+	help( "cannot open nationalities" );
+}
+
 $i = 0;
 while( ($data = fgetcsv($handle, 1000, ",")) !== false ) {
 	if( 0 === $i++ ) {
 		continue;
 	}
 	list( $iso, $entity_id, $citizen_it_m, $citizen_it_f, $city_en ) = $data;
 	$COUNTRIES[ $iso ] = [
 		'iso'          => $iso,
 		'entity-id'    => $entity_id,
 		'citizen.it.m' => $citizen_it_m,
 		'citizen.it.f' => $citizen_it_f,
 		'name.en'      => $city_en,
 	];
 }
 fclose( $handle );
 
 // new volleyball players
 $NEW_PLAYERS = [];
 $i = 0;
-$handle = fopen( 'data/2018-legavolley-volleyball-players.csv', 'r' ) or die( 'cannot open volleyball players' );
+$handle = @fopen( $input_csv, 'r' );
+if( !$handle ) {
+	help( "cannot open volleyball players from CSV file: $input_csv" );
+}
 while( ($data = fgetcsv($handle, 1000, ",")) !== false ) {
 	if( 0 === $i++ ) {
 		continue;
 	}
 
 	// normalization
 	array_walk( $data, function ( & $value ) {
 		trim( $value );
 	} );
 
 	list( $legavolley_id, $surname, $name, $height, $birthday_raw, $country_raw, , , ) = $data;
 
 	$height   = 'NULL' === $height       ? null : (int) $height;
 	$birthday = 'NULL' === $birthday_raw ? null : DateTime::createFromFormat( 'd/m/Y', $birthday_raw );
 
 	if( false === $birthday ) {
 		die( "wrong birthday $birthday_raw" );
 	}
 
 	$country_data = $COUNTRIES[ $country_raw ];
 	$country_data or die( "missing country $country_raw" );
 
 	// code => data
 	$NEW_PLAYERS[ $data[ 0 ] ] = [
 		'name'          => $name,
 		'surname'       => $surname,
 		'legavolley-id' => $legavolley_id,
 		'height'        => $height,
 		'birthday'      => $birthday,
 		'country-data'  => $country_data,
 		'img'           => sprintf( '%s %s (Legavolley 2018).jpg', $name, $surname ),
 	];
 }
 fclose( $handle );
 
 // existing volleyball players
 $asd = date( 'U' );
 $datas = \wm\Wikidata::querySPARQL(
 	  "# Sorry but I have to invalidate this cache somehow: $asd. asd\n"
 	. "SELECT ?item ?legavolley_id "
 	. "WHERE "
 	. "{ "
 	. "  ?item wdt:P4303 ?legavolley_id." // ID LegaVolley
 	. "}"
 );
 
 // existing players (LegaVolleyID => Wikidata entity ID)
 $EXISTING_PLAYERS = [];
 foreach( $datas as $data ) {
 	$entity = str_replace( 'http://www.wikidata.org/entity/', '', $data->item->value );
 	$legavolley_id = strtoupper( $data->legavolley_id->value );
 	$EXISTING_PLAYERS[ $legavolley_id ] = $entity;
 }
 
 $out = fopen('out.csv', 'w');
 
 // Wikidata
 $wd = \wm\Wikidata::instance()->login();
 foreach( $NEW_PLAYERS as $NEW_PLAYER ) {
 
 	$name          = $NEW_PLAYER[ 'name'          ];
 	$surname       = $NEW_PLAYER[ 'surname'       ];
 	$legavolley_id = $NEW_PLAYER[ 'legavolley-id' ];
 	$country       = $NEW_PLAYER[ 'country-data'  ];
 	$height        = $NEW_PLAYER[ 'height'        ];
 	$birthday      = $NEW_PLAYER[ 'birthday'      ];
 	$changes       = [];
 
 	$entity_id = false;
 	if( isset( $EXISTING_PLAYERS[ $legavolley_id ] ) ) {
 		$entity_id = $EXISTING_PLAYERS[ $legavolley_id ];
 	}
 
 	if( !$entity_id ) {
 		echo "Look for an existing? https://www.wikidata.org/w/index.php?search=" . urlencode( "$name $surname" ) . "\n";
 		$entity_id = cli\Input::askInput( "Enter entity ID or nothing (expected code: $legavolley_id)", false );
 	}
 
 	if( !$entity_id ) {
 		continue;
 	}
 
 	// eventually skip until reached wanted ID
 	if( $start_from_qid ) {
 		if( $entity_id !== $start_from_qid ) {
 			continue;
 		}
 		$start_from_qid = null;
 	}
 
 	// Wikidata statements
 	$STATEMENTS = [
 		// ID LegaVolley
 		new wb\StatementString( 'P4303', $legavolley_id ),
 		// Image
 //		new wb\StatementCommonsMedia( 'P18', $NEW_PLAYER[ 'img' ] ),
 		// Country of citizenship
 		new wb\StatementItem( 'P27', $country[ 'entity-id' ] ),
 		// Instance of: human
 		new wb\StatementItem('P31', 'Q5'),
 		// Sex: male
 		new wb\StatementItem( 'P21', 'Q6581097' ),
 		// Occupation: volleyball player
 		new wb\StatementItem( 'P106', 'Q15117302' ),
 		// Sport: volleyball
 		new wb\StatementItem( 'P641', 'Q1734' ),
 	];
 	if( $birthday ) {
 		$STATEMENTS[] = new wb\StatementTime(
 			'P569', // date of birth
 			$birthday->format( '+Y-m-d\T00:00:00\Z' ),
 			wb\DataValueTime::PRECISION_DAYS
 		);
 	}
 	if( $height ) {
 		$STATEMENTS[] = new wb\StatementQuantity(
 			'P2048', // height
 			$height,
 			'Q174728' // centimeter
 		);
 	}
 
 	// Wikidata labels
 	$LABELS = [
 		'en' => sprintf( '%s %s', $name, $surname ),
 		'it' => sprintf( '%s %s', $name, $surname ),
 	];
 	$DESCRIPTIONS = [
 		'en' => 'volleyball player',
 		'it' => sprintf( 'pallavolista %s', $country[ 'citizen.it.m' ] ),
 	];
 
 	// item with data to be added
 	$data_new = new wb\DataModel();
 
 	// Existing data
 	$data_old = null;
 	if( $entity_id ) {
 		// https://www.wikidata.org/w/api.pkhp?action=help&modules=wbgetentities
 		$data_old = $wd->fetch( [
 			'action' => 'wbgetentities',
 			'ids'    => $entity_id,
 			'props'  => 'info|sitelinks|aliases|labels|descriptions|claims|datatype'
 		] );
 		$data_old = wb\DataModel::createFromObject( $data_old->entities->{ $entity_id } );
 	}
 
 	// append labels without overwriting
 	foreach( $LABELS as $lang => $text ) {
 		if( ! $data_old || ! $data_old->hasLabelInLanguage( $lang ) ) {
 			$data_new->setLabel( new wb\LabelAction( $lang, $text, wb\LabelAction::ADD ) );
 			$changes[] = "+[label][$lang]";
 		}
 	}
 
 	// append descriptions without overwriting
 	foreach( $DESCRIPTIONS as $lang => $text ) {
 		if( ! $data_old || ! $data_old->hasDescriptionInLanguage( $lang ) ) {
 			$data_new->setDescription( new wb\DescriptionAction( $lang, $text, wb\DescriptionAction::ADD ) );
 			$changes[] = "+[description][$lang]";
 		}
 	}
 
 	// append statements without duplicating
 	foreach( $STATEMENTS as $statement ) {
 		$property = $statement->getMainsnak()->getProperty();
 		if( ! $data_old || ! $data_old->hasClaimsInProperty( $property ) ) {
 			$data_new->addClaim( $statement->setReferences( legavolley_references() ) );
 
 			// add involved property in the summary
 			$claims = $data_new->getClaimsInProperty( $property );
 			$num = count( $claims );
 			if( $num > 1 ) {
 				$changes[] = "+[[P:$property]] ($num values)";
 			} elseif( 1 === $num ) {
 				$changes[] = "+[[P:$property]] " . $claims[ 0 ]->getMainSnak()->getDataValue();
 			}
 		}
 	}
 
 	// Wikidata new data
 	$wbeditentity = [
 		'summary.pre' => SUMMARY . ' ',
 		'bot'         => 1,
 	];
 
 	if( $entity_id ) {
 		if( $data_new->countClaims() ) {
 			print_r( $changes );
 			// https://www.wikidata.org/w/api.php?action=help&modules=wbeditentity
 			if( $ALWAYS || 'y' === cli\Input::yesNoQuestion( "Save $name $surname $entity_id?" ) ) {
 				$wd->editEntity( array_replace( $wbeditentity, [
 					'id'   => $entity_id,
 					'data' => $data_new->getJSON()
 				] ) );
 			}
 		} else {
 			Log::info( "Nothing to be done to $name $surname $entity_id" );
 		}
 	} else {
 		print_r( $changes );
 		if( $ALWAYS || 'y' === cli\Input::yesNoQuestion( "Create $name $surname?" ) ) {
 			// Create new item
 			// https://www.wikidata.org/w/api.php?action=help&modules=wbeditentity
 			$result = $wd->editEntity( array_replace( $wbeditentity, [
 				'new'  => 'item',
 				'data' => $data_new->getJSON()
 			] ) );
 
 			var_dump( $result );
 			echo "TODO: get the QID from that shit";
 			exit( 2 );
 		}
 	}
 
 	fputcsv($out, [
 		$entity_id,
 		$name,
 		$surname,
 		$legavolley_id,
 	] );
 }
 
 fclose($out);
 
 echo "End of the story\n";
 
 ##############################
 # Legavolley referenced claims
 ##############################
 
 function legavolley_references() {
 
 	$references = new References();
 
 	// stated in: Lega Pallavolo Serie A
 	$reference = new Reference();
 	$reference->add( new SnakItem( 'P248', 'Q16571730' ) );
 	$references->add( $reference );
 
 	return $references;
 }
+
+/**
+ * Show an help menu and quit
+ *
+ * @param string $error_message Error message
+ */
+function help( $error_message = null ) {
+	global $opts, $argv;
+
+	echo "Usage:\n {$argv[ 0 ]} file.csv [OPTIONS]\n";
+	echo "OPTIONS:\n";
+	foreach( $opts->getParams() as $param ) {
+		$commands = [];
+		if( $param->hasLongName() ) {
+			$commands[] = '--' . $param->getLongName();
+		}
+		if( $param->hasShortName() ) {
+			$commands[] = '-' . $param->getShortName();
+		}
+		$command = implode( '|', $commands );
+		if( $command && ! $param->isFlag() ) {
+			$command .= $param->isValueOptional()
+				? '=[VALUE]'
+				: '=VALUE';
+		}
+		printf( ' % -20s ', $command );
+		if( $param->hasDescription() ) {
+			echo ' ' . $param->getDescription();
+		}
+		echo "\n";
+	}
+	if( $error_message ) {
+		echo "\nError: $error_message\n";
+		exit( 1 );
+	}
+	exit( 0 );
+}