diff --git a/README-ru.md b/README-ru.md
index a870f6b..e3ad9b1 100644
--- a/README-ru.md
+++ b/README-ru.md
@@ -245,6 +245,14 @@ MoneySpeller::spell(123.45, MoneySpeller::RUBLE, MoneySpeller::CLARIFICATION_FOR
 
 При указании валюты используйте знак валюты (например, ₽) или трехзначный код валюты (`\morphos\Currency::RUBLE`).
 
+Также можно указать падеж для склонения четвёртым параметром:
+
+```php
+use morphos\Russian\MoneySpeller;
+
+MoneySpeller::spell(123.45, MoneySpeller::RUBLE, MoneySpeller::NORMAL_FORMAT, 'родительный') => 'ста двадцати трех рублей сорока пяти копеек'
+```
+
 Доступные валюты:
 
 | Знак | Идентификатор                | Валюта |
diff --git a/src/MoneySpeller.php b/src/MoneySpeller.php
index bc892bb..724b5b2 100644
--- a/src/MoneySpeller.php
+++ b/src/MoneySpeller.php
@@ -10,9 +10,16 @@ abstract class MoneySpeller implements Currency
 
     /**
      * @abstract
-     * @param float $value
+     *
+     * @param float  $value
      * @param string $currency
      * @param string $format
+     * @param null   $case
      */
-    public static function spell($value, $currency, $format = self::NORMAL_FORMAT) {}
+    public static function spell(
+        $value,
+        $currency,
+        $format = self::NORMAL_FORMAT,
+        $case = null
+    ) {}
 }
diff --git a/src/Russian/MoneySpeller.php b/src/Russian/MoneySpeller.php
index f4d529a..3795c25 100644
--- a/src/Russian/MoneySpeller.php
+++ b/src/Russian/MoneySpeller.php
@@ -28,13 +28,19 @@ class MoneySpeller extends \morphos\MoneySpeller
 
     /**
      * @param float|integer $value
-     * @param string $currency
-     * @param string $format
+     * @param string        $currency
+     * @param string        $format
+     * @param null          $case
+     *
      * @return string
-     * @throws \InvalidArgumentException
      * @throws \Exception
      */
-    public static function spell($value, $currency, $format = self::NORMAL_FORMAT)
+    public static function spell(
+        $value,
+        $currency,
+        $format = self::NORMAL_FORMAT,
+        $case = null
+    )
     {
         $currency = static::canonizeCurrency($currency);
 
@@ -43,22 +49,35 @@ public static function spell($value, $currency, $format = self::NORMAL_FORMAT)
 
         switch ($format) {
             case static::SHORT_FORMAT:
-                return $integer.' '.NounPluralization::pluralize(static::$labels[$currency][0], $integer)
+                return $integer.' '.NounPluralization::pluralize(static::$labels[$currency][0], $integer, false, $case)
                     .($fractional > 0
-                        ? ' '.$fractional.' '.NounPluralization::pluralize(static::$labels[$currency][2], $fractional)
+                        ? ' '.$fractional.' '.NounPluralization::pluralize(static::$labels[$currency][2],
+                            $fractional, false, $case)
                         : null);
 
             case static::NORMAL_FORMAT:
             case static::CLARIFICATION_FORMAT:
             case static::DUPLICATION_FORMAT:
 
-                $integer_speelled = CardinalNumeralGenerator::getCase($integer, Cases::IMENIT, static::$labels[$currency][1]);
-                $fractional_speelled = CardinalNumeralGenerator::getCase($fractional, Cases::IMENIT, static::$labels[$currency][3]);
+                $integer_spelled = CardinalNumeralGenerator::getCase(
+                    $integer,
+                    $case !== null ? $case : Cases::IMENIT,
+                    static::$labels[$currency][1]);
+                $fractional_spelled = CardinalNumeralGenerator::getCase(
+                    $fractional,
+                    $case !== null ? $case : Cases::IMENIT,
+                    static::$labels[$currency][3]);
 
                 if ($format == static::CLARIFICATION_FORMAT) {
-                    return $integer.' ('.$integer_speelled.') '.NounPluralization::pluralize(static::$labels[$currency][0], $integer).' '.$fractional.' ('.$fractional_speelled.') '.NounPluralization::pluralize(static::$labels[$currency][2], $fractional);
+                    return $integer.' ('.$integer_spelled.') '
+                        .NounPluralization::pluralize(static::$labels[$currency][0], $integer, false, $case).' '
+                        .$fractional.' ('.$fractional_spelled.') '
+                        .NounPluralization::pluralize(static::$labels[$currency][2], $fractional, false, $case);
                 } else {
-                    return $integer_speelled.($format == static::DUPLICATION_FORMAT ? ' ('.$integer.')' : null).' '.NounPluralization::pluralize(static::$labels[$currency][0], $integer).' '.$fractional_speelled.($format == static::DUPLICATION_FORMAT ? ' ('.$fractional.')' : null).' '.NounPluralization::pluralize(static::$labels[$currency][2], $fractional);
+                    return $integer_spelled.($format == static::DUPLICATION_FORMAT ? ' ('.$integer.')' : null)
+                        .' '.NounPluralization::pluralize(static::$labels[$currency][0], $integer, false, $case).' '
+                        .$fractional_spelled.($format == static::DUPLICATION_FORMAT ? ' ('.$fractional.')' : null).' '
+                        .NounPluralization::pluralize(static::$labels[$currency][2], $fractional, false, $case);
                 }
         }
     }
diff --git a/tests/Russian/MoneySpellerTest.php b/tests/Russian/MoneySpellerTest.php
index 23535c2..d228cb7 100644
--- a/tests/Russian/MoneySpellerTest.php
+++ b/tests/Russian/MoneySpellerTest.php
@@ -1,19 +1,34 @@
 <?php
 namespace morphos\test\Russian;
 
-
-use morphos\Gender;
 use morphos\Currency;
+use morphos\Russian\Cases;
 use morphos\Russian\MoneySpeller;
 
 class MoneySpellerTest extends \PHPUnit_Framework_TestCase
 {
+
     /**
      * @dataProvider moneyAmountsProvider()
+     *
+     * @param      $value
+     * @param      $currency
+     * @param      $format
+     * @param      $result
+     *
+     * @param null $case
+     *
+     * @throws \Exception
      */
-    public function testSpell($value, $currency, $format, $result)
+    public function testSpell(
+        $value,
+        $currency,
+        $format,
+        $result,
+        $case = null
+    )
     {
-        $this->assertEquals($result, MoneySpeller::spell($value, $currency, $format));
+        $this->assertEquals($result, MoneySpeller::spell($value, $currency, $format, $case));
     }
 
     public function moneyAmountsProvider()
@@ -22,6 +37,7 @@ public function moneyAmountsProvider()
         [
             [123.45, Currency::RUBLE, MoneySpeller::SHORT_FORMAT, '123 рубля 45 копеек'],
             [321.54, Currency::DOLLAR, MoneySpeller::NORMAL_FORMAT, 'триста двадцать один доллар пятьдесят четыре цента'],
+            [321.54, Currency::DOLLAR, MoneySpeller::NORMAL_FORMAT, 'трехсот двадцати одного доллара пятидесяти четырех центов', Cases::RODIT],
             [369.12, Currency::EURO, MoneySpeller::DUPLICATION_FORMAT, 'триста шестьдесят девять (369) евро двенадцать (12) центов'],
             [246.35, Currency::YEN, MoneySpeller::CLARIFICATION_FORMAT, '246 (двести сорок шесть) иен 35 (тридцать пять) сенов'],
             [123, Currency::POUND, MoneySpeller::SHORT_FORMAT, '123 фунта'],
@@ -37,6 +53,7 @@ public function moneyAmountsProvider()
 
     /**
      * @expectedException InvalidArgumentException
+     * @throws \Exception
      */
     public function testSpellInvalid()
     {