diff --git a/src/CrowdinApiClient/Model/SourceString.php b/src/CrowdinApiClient/Model/SourceString.php
index caed6d38..d98b60a0 100644
--- a/src/CrowdinApiClient/Model/SourceString.php
+++ b/src/CrowdinApiClient/Model/SourceString.php
@@ -2,6 +2,8 @@
 
 namespace CrowdinApiClient\Model;
 
+use InvalidArgumentException;
+
 /**
  * @package Crowdin\Model
  */
@@ -38,7 +40,7 @@ class SourceString extends BaseModel
     protected $identifier;
 
     /**
-     * @var string
+     * @var string|array
      */
     protected $text;
 
@@ -102,9 +104,6 @@ class SourceString extends BaseModel
      */
     protected $masterStringId;
 
-    /**
-     * @param array $data
-     */
     public function __construct(array $data = [])
     {
         parent::__construct($data);
@@ -112,10 +111,16 @@ public function __construct(array $data = [])
         $this->id = (integer)$this->getDataProperty('id');
         $this->projectId = (integer)$this->getDataProperty('projectId');
         $this->fileId = (integer)$this->getDataProperty('fileId');
-        $this->branchId = $this->getDataProperty('branchId') ? (integer)$this->getDataProperty('branchId') : null;
-        $this->directoryId = $this->getDataProperty('directoryId') ? (integer)$this->getDataProperty('directoryId') : null;
+        $this->branchId = $this->getDataProperty('branchId')
+            ? (integer)$this->getDataProperty('branchId')
+            : null;
+        $this->directoryId = $this->getDataProperty('directoryId')
+            ? (integer)$this->getDataProperty('directoryId')
+            : null;
         $this->identifier = (string)$this->getDataProperty('identifier');
-        $this->text = (string)$this->getDataProperty('text');
+        $this->text = is_array($this->getDataProperty('text'))
+            ? $this->getDataProperty('text')
+            : (string)$this->getDataProperty('text');
         $this->type = (string)$this->getDataProperty('type');
         $this->context = (string)$this->getDataProperty('context');
         $this->maxLength = (integer)$this->getDataProperty('maxLength');
@@ -179,18 +184,34 @@ public function getIdentifier(): string
     }
 
     /**
-     * @return string
+     * @return string|array
      */
-    public function getText(): string
+    public function getText()
     {
         return $this->text;
     }
 
     /**
-     * @param string $text
+     * @param string|array $text
      */
-    public function setText(string $text): void
+    public function setText($text): void
     {
+        if (gettype($this->text) !== gettype($text)) {
+            throw new InvalidArgumentException(
+                sprintf(
+                    'Argument "text" must have the same type as the current value. Current value type: %s',
+                    gettype($this->text)
+                )
+            );
+        }
+
+        if (
+            is_array($text) &&
+            (array_diff_key($this->text, $text) !== [] || array_diff_key($text, $this->text) !== [])
+        ) {
+            throw new InvalidArgumentException('Argument "text" must have the same keys as the current value');
+        }
+
         $this->text = $text;
     }
 
@@ -266,6 +287,15 @@ public function isHasPlurals(): bool
         return $this->hasPlurals;
     }
 
+    /**
+     * Alias of isHasPlurals
+     * @return bool
+     */
+    public function isPlural(): bool
+    {
+        return $this->hasPlurals;
+    }
+
     /**
      * @return bool
      */
diff --git a/tests/CrowdinApiClient/Model/SourceStringTest.php b/tests/CrowdinApiClient/Model/SourceStringTest.php
index 66016ff6..fac34497 100644
--- a/tests/CrowdinApiClient/Model/SourceStringTest.php
+++ b/tests/CrowdinApiClient/Model/SourceStringTest.php
@@ -3,12 +3,9 @@
 namespace CrowdinApiClient\Tests\Model;
 
 use CrowdinApiClient\Model\SourceString;
+use InvalidArgumentException;
 use PHPUnit\Framework\TestCase;
 
-/**
- * Class SourceStringTest
- * @package Crowdin\Tests\Model
- */
 class SourceStringTest extends TestCase
 {
     /**
@@ -35,16 +32,16 @@ class SourceStringTest extends TestCase
         'createdAt' => '2019-09-20T12:43:57+00:00',
         'updatedAt' => '2019-09-20T13:24:01+00:00',
         'isDuplicate' => true,
-        'masterStringId' => 1234
+        'masterStringId' => 1234,
     ];
 
-    public function testLoadData()
+    public function testLoadData(): void
     {
         $this->sourceString = new SourceString($this->data);
         $this->checkData();
     }
 
-    public function testSetData()
+    public function testSetData(): void
     {
         $this->sourceString = new SourceString();
         $this->sourceString->setText($this->data['text']);
@@ -59,7 +56,7 @@ public function testSetData()
         $this->assertEquals($this->data['isHidden'], $this->sourceString->isHidden());
     }
 
-    public function checkData()
+    public function checkData(): void
     {
         $this->assertEquals($this->data['id'], $this->sourceString->getId());
         $this->assertEquals($this->data['projectId'], $this->sourceString->getProjectId());
@@ -74,6 +71,7 @@ public function checkData()
         $this->assertEquals($this->data['isHidden'], $this->sourceString->isHidden());
         $this->assertEquals($this->data['revision'], $this->sourceString->getRevision());
         $this->assertEquals($this->data['hasPlurals'], $this->sourceString->isHasPlurals());
+        $this->assertEquals($this->data['hasPlurals'], $this->sourceString->isPlural());
         $this->assertEquals($this->data['isIcu'], $this->sourceString->isIcu());
         $this->assertEquals($this->data['labelIds'], $this->sourceString->getLabelIds());
         $this->assertEquals($this->data['createdAt'], $this->sourceString->getCreatedAt());
@@ -81,4 +79,95 @@ public function checkData()
         $this->assertEquals($this->data['isDuplicate'], $this->sourceString->isDuplicate());
         $this->assertEquals($this->data['masterStringId'], $this->sourceString->getMasterStringId());
     }
+
+    public function testSetPlainText(): void
+    {
+        $text = 'Updated plain text';
+
+        $sourceString = new SourceString(['text' => 'Plain text']);
+        $sourceString->setText($text);
+
+        $this->assertSame($text, $sourceString->getText());
+    }
+
+    public function testSetPluralText(): void
+    {
+        $text = [
+            'one' => 'Updated one',
+            'other' => 'Updated other',
+        ];
+
+        $sourceString = new SourceString([
+            'text' => [
+                'one' => 'One',
+                'other' => 'Other',
+            ],
+        ]);
+        $sourceString->setText($text);
+
+        $this->assertSame($text, $sourceString->getText());
+    }
+
+    public function textExceptionDataProvider(): array
+    {
+        return [
+            'typeMismatchA' => [
+                'originalText' => 'Plain text',
+                'updatedText' => [
+                    'one' => 'One',
+                    'other' => 'Other',
+                ],
+                'expectedExceptionMessage' =>
+                    'Argument "text" must have the same type as the current value. ' .
+                    'Current value type: string',
+            ],
+            'typeMismatchB' => [
+                'originalText' => [
+                    'one' => 'One',
+                    'other' => 'Other',
+                ],
+                'updatedText' => 'Plain text',
+                'expectedExceptionMessage' =>
+                    'Argument "text" must have the same type as the current value. ' .
+                    'Current value type: array',
+            ],
+            'extraForm' => [
+                'originalText' => [
+                    'one' => 'One',
+                    'other' => 'Other',
+                ],
+                'updatedText' => [
+                    'one' => 'One',
+                    'many' => 'Many',
+                    'other' => 'Other',
+                ],
+                'expectedExceptionMessage' => 'Argument "text" must have the same keys as the current value',
+            ],
+            'missingForm' => [
+                'originalText' => [
+                    'one' => 'One',
+                    'other' => 'Other',
+                ],
+                'updatedText' => [
+                    'other' => 'Other',
+                ],
+                'expectedExceptionMessage' => 'Argument "text" must have the same keys as the current value',
+            ],
+        ];
+    }
+
+    /**
+     * @dataProvider textExceptionDataProvider
+     * @param string|array $originalText
+     * @param string|array $updatedText
+     * @param string $expectedExceptionMessage
+     */
+    public function testSetTextException($originalText, $updatedText, string $expectedExceptionMessage): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage($expectedExceptionMessage);
+
+        $sourceString = new SourceString(['text' => $originalText]);
+        $sourceString->setText($updatedText);
+    }
 }