diff --git a/src/Schema/Column/ColumnSchemaInterface.php b/src/Schema/Column/ColumnSchemaInterface.php
index ef9a9de89..d979cf7fd 100644
--- a/src/Schema/Column/ColumnSchemaInterface.php
+++ b/src/Schema/Column/ColumnSchemaInterface.php
@@ -28,6 +28,7 @@
  *     table?: string|null,
  *     type?: string,
  *     unsigned?: bool|string,
+ *     ...
  * }
  */
 interface ColumnSchemaInterface
diff --git a/tests/AbstractColumnFactoryTest.php b/tests/AbstractColumnFactoryTest.php
index 54ea35893..8ade7dbe6 100644
--- a/tests/AbstractColumnFactoryTest.php
+++ b/tests/AbstractColumnFactoryTest.php
@@ -5,6 +5,7 @@
 namespace Yiisoft\Db\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Yiisoft\Db\Schema\Column\StringColumnSchema;
 use Yiisoft\Db\Tests\Support\TestTrait;
 
 abstract class AbstractColumnFactoryTest extends TestCase
@@ -56,4 +57,17 @@ public function testFromType(string $type, string $expectedType, string $expecte
         $this->assertInstanceOf($expectedInstanceOf, $column);
         $this->assertSame($expectedType, $column->getType());
     }
+
+    public function testFromDefinitionWithExtra(): void
+    {
+        $db = $this->getConnection();
+        $factory = $db->getSchema()->getColumnFactory();
+
+        $column = $factory->fromDefinition('char(1) NOT NULL', ['extra' => 'UNIQUE']);
+
+        $this->assertInstanceOf(StringColumnSchema::class, $column);
+        $this->assertSame('char', $column->getType());
+        $this->assertSame(1, $column->getSize());
+        $this->assertSame('NOT NULL UNIQUE', $column->getExtra());
+    }
 }
diff --git a/tests/Provider/ColumnSchemaProvider.php b/tests/Provider/ColumnSchemaProvider.php
index cce582793..4ae2a12a2 100644
--- a/tests/Provider/ColumnSchemaProvider.php
+++ b/tests/Provider/ColumnSchemaProvider.php
@@ -274,6 +274,10 @@ public static function load(): array
             ['name', null, 'getName', null],
             ['precision', 10, 'getPrecision', 10],
             ['precision', null, 'getPrecision', null],
+            ['primary_key', true, 'isPrimaryKey', true],
+            ['primary_key', false, 'isPrimaryKey', false],
+            ['primary_key', '1', 'isPrimaryKey', true],
+            ['primary_key', '0', 'isPrimaryKey', false],
             ['scale', 2, 'getScale', 2],
             ['scale', null, 'getScale', null],
             ['size', 255, 'getSize', 255],