diff --git a/phpstan.neon b/phpstan.neon
index ebc26f4..764ec03 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -4,3 +4,7 @@ parameters:
 	paths:
 		- src
 		- tests
+
+	fileExtensions:
+		- php
+		- phpt
diff --git a/src/ForeignKey.php b/src/ForeignKey.php
index ffedd61..5e6cbb2 100644
--- a/src/ForeignKey.php
+++ b/src/ForeignKey.php
@@ -10,7 +10,7 @@ class ForeignKey
 		const ACTION_CASCADE = 'CASCADE';
 		const ACTION_SET_NULL = 'SET NULL';
 
-		/** @var string */
+		/** @var string|NULL */
 		private $name;
 
 		/** @var string[] */
@@ -30,7 +30,7 @@ class ForeignKey
 
 
 		/**
-		 * @param  string $name
+		 * @param  string|NULL $name
 		 * @param  string[]|string $columns
 		 * @param  string|NULL $targetTable
 		 * @param  string[]|string $targetColumns
@@ -59,7 +59,7 @@ public function __construct($name, $columns, $targetTable, $targetColumns)
 
 
 		/**
-		 * @return string
+		 * @return string|NULL
 		 */
 		public function getName()
 		{
diff --git a/src/Index.php b/src/Index.php
index 01e6dce..1fcfff5 100644
--- a/src/Index.php
+++ b/src/Index.php
@@ -10,7 +10,7 @@ class Index
 		const TYPE_UNIQUE = 'UNIQUE';
 		const TYPE_FULLTEXT = 'FULLTEXT';
 
-		/** @var string */
+		/** @var string|NULL */
 		private $name;
 
 		/** @var string */
@@ -21,7 +21,7 @@ class Index
 
 
 		/**
-		 * @param  string $name
+		 * @param  string|NULL $name
 		 * @param  string[]|string $columns
 		 * @param  string $type
 		 */
@@ -41,7 +41,7 @@ public function __construct($name, $columns = [], $type = self::TYPE_INDEX)
 
 
 		/**
-		 * @return string
+		 * @return string|NULL
 		 */
 		public function getName()
 		{
diff --git a/src/Table.php b/src/Table.php
index 01fb709..6694a96 100644
--- a/src/Table.php
+++ b/src/Table.php
@@ -98,7 +98,7 @@ public function getOptions()
 		 * @param  string|Column $name
 		 * @param  string|NULL $type
 		 * @param  array<scalar>|NULL $parameters
-		 * @param  array<string, string> $options OPTION => NULL
+		 * @param  array<string|int, scalar|NULL> $options OPTION => NULL
 		 * @return Column
 		 */
 		public function addColumn($name, $type = NULL, array $parameters = NULL, array $options = [])
@@ -162,7 +162,7 @@ public function getColumns()
 
 
 		/**
-		 * @param  string|Index $name
+		 * @param  string|Index|NULL $name
 		 * @param  string[]|string $columns
 		 * @param  string $type
 		 * @return Index
@@ -229,7 +229,7 @@ public function getIndexes()
 
 
 		/**
-		 * @param  string|ForeignKey $name
+		 * @param  string|ForeignKey|NULL $name
 		 * @param  string[]|string $columns
 		 * @param  string $targetTable
 		 * @param  string[]|string $targetColumns
diff --git a/tests/SqlSchema/Table.validate.phpt b/tests/SqlSchema/Table.validate.phpt
index 0f85b39..33f9581 100644
--- a/tests/SqlSchema/Table.validate.phpt
+++ b/tests/SqlSchema/Table.validate.phpt
@@ -29,5 +29,8 @@ test(function () {
 test(function () {
 	$table = new Table('book');
 	$table->addColumn('id', 'INT');
-	Assert::null($table->validate());
+
+	Assert::noError(function () use ($table) {
+		$table->validate();
+	});
 });