diff --git a/src/Faker/Provider/pl_PL/Address.php b/src/Faker/Provider/pl_PL/Address.php
index 5cab0a95..9a945b78 100644
--- a/src/Faker/Provider/pl_PL/Address.php
+++ b/src/Faker/Provider/pl_PL/Address.php
@@ -13,6 +13,9 @@ class Address extends \Faker\Provider\Address
 
     protected static $buildingNumber = array('##A', '##', '##A/##', '##/##');
     protected static $postcode = array('##-###');
+	/**
+	 * @var array full list of Polish voivodeship
+	 */
 	protected static $state = array(
 		'dolnośląskie','kujawsko-pomorskie','lubelskie','lubuskie','łódzkie','małopolskie','mazowieckie','opolskie','podkarpackie',
 		'podlaskie','pomorskie','śląskie','świętokrzyskie','warmińsko-mazurskie','wielkopolskie','zachodniopomorskie'
@@ -20,6 +23,9 @@ class Address extends \Faker\Provider\Address
     protected static $country = array(
 		'Polska',
 	);
+	/**
+	 * @var array 250 Polish cities with biggest number of streets. Extracted from data issued by the official public postal service of Poland. @link http://www.poczta-polska.pl/
+	 */
 	protected static $city = array(
 		'Warszawa','Kraków','Łódź','Poznań','Wrocław','Gdańsk','Szczecin','Bydgoszcz','Lublin','Bielsko-Biała','Częstochowa','Katowice','Białystok','Gdynia','Radom',
 		'Rzeszów','Gliwice','Kielce','Opole','Rybnik','Sosnowiec','Zabrze','Ruda Śląska','Jaworzno','Olsztyn','Zielona Góra','Bytom','Koszalin','Dąbrowa Górnicza',
@@ -39,6 +45,9 @@ class Address extends \Faker\Provider\Address
 		'Kętrzyn','Ostróda','Bochnia','Jelcz-Laskowice','Ząbki','Września','Bielawa','Nowy Targ','Giżycko','Dzierżoniów','Myszków','Marylka','Czechowice-Dziedzice','Łowicz','Łomianki','Świebodzice',
 		'Świebodzin','Lubojenka','Lubliniec','Świecie','Lubartów','Lidzbark Warmiński','Świdnik','Pisz','Szczytno','Świdwin','Kozienice','Brodnica','Kościerzyna','Braniewo','Koło'
 	);
+	/**
+	 * @var array 549 most common Polish street names. Extracted from data issued by the official public postal service of Poland. @link http://www.poczta-polska.pl/
+	 */
 	protected static $street = array(
 		'Kościuszki Tadeusza','Mickiewicza Adama','Szkolna','Dworcowa','Kolejowa','Sienkiewicza Henryka','Rynek','Warszawska','Wojska Polskiego','Żeromskiego Stefana',
 		'Polna','1 Maja','Ogrodowa','Pocztowa','Grunwaldzka','Kopernika Mikołaja','Leśna','Lipowa','Słowackiego Juliusza','Parkowa','Kościelna','Jagiellońska','Słoneczna',
diff --git a/src/Faker/Provider/pl_PL/Person.php b/src/Faker/Provider/pl_PL/Person.php
index 9c88db89..e6727e7e 100644
--- a/src/Faker/Provider/pl_PL/Person.php
+++ b/src/Faker/Provider/pl_PL/Person.php
@@ -53,13 +53,17 @@ class Person extends \Faker\Provider\Person
     }
 
 	/**
+	 * PESEL - Universal Electronic System for Registration of the Population
+	 * @link http://en.wikipedia.org/wiki/PESEL
 	 * @param DateTime $birthdate
 	 * @param string $sex M for male or F for female
+	 * @return string 11 digit number, like 44051401358
 	 */
 	public static function pesel($birthdate = null, $sex = null)
 	{
-		if ($birthdate === null)
-			$birthdate = new \DateTime(date('Y-m-d',mt_rand(strtotime('1800-01-0'), time())));
+		if ($birthdate === null) {
+			$birthdate = \Faker\Provider\DateTime::dateTimeThisCentury();
+		}
 
 		$weights = array(1, 3, 7, 9, 1, 3, 7, 9, 1, 3);
 		$length = count($weights);
@@ -75,9 +79,9 @@ class Person extends \Faker\Provider\Person
 			$result[$i] = static::randomDigit();
 		}
 		if ($sex == "M") {
-			$b[$length - 1] |= 1;
+			$result[$length - 1] |= 1;
 		} elseif ($sex == "F") {
-			$b[$length - 1] ^= 1;
+			$result[$length - 1] ^= 1;
 		}
 		$checksum = 0;
 		for ($i = 0; $i < $length; $i++) {
@@ -88,6 +92,11 @@ class Person extends \Faker\Provider\Person
 		return implode('',$result);
 	}
 
+	/**
+	 * National Identity Card number
+	 * @link http://en.wikipedia.org/wiki/Polish_National_Identity_Card
+	 * @return string 3 letters and 6 digits, like ABA300000
+	 */
 	public static function personalIdentityNumber()
 	{
 		$range = str_split("ABCDEFGHIJKLMNPRSTUVWXYZ");
@@ -104,4 +113,30 @@ class Person extends \Faker\Provider\Person
 		$checksum %= 10;
 		return implode('',$low).$checksum.implode('',$high);
 	}
+
+	/**
+	 * Taxpayer Identification Number (NIP in Polish)
+	 * @link http://en.wikipedia.org/wiki/PESEL#Other_identifiers
+	 * @link http://pl.wikipedia.org/wiki/NIP
+	 * @return string 10 digit number
+	 */
+	public static function taxpayerIdentificationNumber()
+	{
+		$weights = array(6, 5, 7, 2, 3, 4, 5, 6, 7);
+		$result = array();
+		do {
+			$result = array(
+				static::randomDigitNotNull(), static::randomDigitNotNull(), static::randomDigitNotNull(),
+				static::randomDigit(), static::randomDigit(), static::randomDigit(),
+				static::randomDigit(), static::randomDigit(), static::randomDigit(),
+			);
+			$checksum = 0;
+			for ($i = 0; $i < count($result); $i++) {
+				$checksum += $weights[$i] * $result[$i];
+			}
+			$checksum %= 11;
+		} while ($checksum == 10);
+		$result[] = $checksum;
+		return implode('', $result);
+	}
 }