diff --git a/readme.md b/readme.md
index 373b181e..f3d42a0b 100644
--- a/readme.md
+++ b/readme.md
@@ -449,6 +449,17 @@ class A
 }
 ```
 
+You can also add existing `ClassType` or `PhpNamespace` objects to the file:
+
+```php
+$namespace = new Nette\PhpGenerator\PhpNamespace('Foo');
+$class = new Nette\PhpGenerator\ClassType('Demo');
+
+$file = new Nette\PhpGenerator\PhpFile;
+$file->add($namespace);
+$file->add($class);
+```
+
 Generate using Reflection
 -------------------------
 
diff --git a/src/PhpGenerator/PhpFile.php b/src/PhpGenerator/PhpFile.php
index c43a7bc0..842c15e4 100644
--- a/src/PhpGenerator/PhpFile.php
+++ b/src/PhpGenerator/PhpFile.php
@@ -29,6 +29,31 @@ final class PhpFile
 	private $namespaces = [];
 
 
+	/**
+	 * @param  ClassType|PhpNamespace  $item
+	 * @return static
+	 */
+	public function add($item): self
+	{
+		if ($item instanceof PhpNamespace) {
+			$this->namespaces[$item->getName()] = $item;
+			foreach ($this->namespaces as $namespace) {
+				$namespace->setBracketedSyntax(count($this->namespaces) > 1 && isset($this->namespaces['']));
+			}
+
+		} elseif ($item instanceof ClassType) {
+			$namespace = $item->getNamespace();
+			$this->addNamespace($namespace ? $namespace->getName() : '')
+				->add($item);
+
+		} else {
+			throw new Nette\InvalidArgumentException('Argument must be ClassType|PhpNamespace.');
+		}
+
+		return $this;
+	}
+
+
 	public function addClass(string $name): ClassType
 	{
 		return $this
@@ -56,10 +81,7 @@ public function addTrait(string $name): ClassType
 	public function addNamespace(string $name): PhpNamespace
 	{
 		if (!isset($this->namespaces[$name])) {
-			$this->namespaces[$name] = new PhpNamespace($name);
-			foreach ($this->namespaces as $namespace) {
-				$namespace->setBracketedSyntax(count($this->namespaces) > 1 && isset($this->namespaces['']));
-			}
+			$this->add(new PhpNamespace($name));
 		}
 		return $this->namespaces[$name];
 	}
diff --git a/tests/PhpGenerator/PhpFile.add.phpt b/tests/PhpGenerator/PhpFile.add.phpt
new file mode 100644
index 00000000..f37e7f65
--- /dev/null
+++ b/tests/PhpGenerator/PhpFile.add.phpt
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+use Nette\PhpGenerator\ClassType;
+use Nette\PhpGenerator\PhpFile;
+use Nette\PhpGenerator\PhpNamespace;
+use Tester\Assert;
+
+require __DIR__ . '/../bootstrap.php';
+
+
+Assert::exception(function () {
+	(new PhpFile)
+		->add(new stdClass);
+}, Nette\InvalidArgumentException::class, 'Argument must be ClassType|PhpNamespace.');
+
+
+$file = (new PhpFile)
+	->add($classA = new ClassType('A'))
+	->add($classB = new ClassType('B', new PhpNamespace('X')))
+	->add(new PhpNamespace('Y'));
+
+$namespaces = $file->getNamespaces();
+Assert::same($namespaces[''], $classA->getNamespace());
+Assert::same($namespaces['X'], $classB->getNamespace());
+Assert::true(isset($namespaces['Y']));
+
+Assert::true($namespaces['']->getBracketedSyntax());
+Assert::true($namespaces['X']->getBracketedSyntax());
+Assert::true($namespaces['Y']->getBracketedSyntax());