diff --git a/src/Document.php b/src/Document.php
index cafa441..ddb75d9 100644
--- a/src/Document.php
+++ b/src/Document.php
@@ -15,6 +15,7 @@
 use alsvanzelf\jsonapi\interfaces\ExtensionInterface;
 use alsvanzelf\jsonapi\interfaces\ProfileInterface;
 use alsvanzelf\jsonapi\objects\JsonapiObject;
+use alsvanzelf\jsonapi\objects\LinkObject;
 use alsvanzelf\jsonapi\objects\LinksObject;
 use alsvanzelf\jsonapi\objects\MetaObject;
 
@@ -22,7 +23,9 @@
  * @see ResourceDocument, CollectionDocument, ErrorsDocument or MetaDocument
  */
 abstract class Document implements DocumentInterface, \JsonSerializable {
-	use AtMemberManager, ExtensionMemberManager, HttpStatusCodeManager, LinksManager;
+	use AtMemberManager, ExtensionMemberManager, HttpStatusCodeManager, LinksManager {
+		LinksManager::addLink as linkManagerAddLink;
+	}
 	
 	const JSONAPI_VERSION_1_0 = '1.0';
 	const JSONAPI_VERSION_1_1 = '1.1';
@@ -97,11 +100,7 @@ public function __construct() {
 	 */
 	public function addLink($key, $href, array $meta=[], $level=Document::LEVEL_ROOT) {
 		if ($level === Document::LEVEL_ROOT) {
-			if ($this->links === null) {
-				$this->setLinksObject(new LinksObject());
-			}
-			
-			$this->links->add($key, $href, $meta);
+			$this->linkManagerAddLink($key, $href, $meta);
 		}
 		elseif ($level === Document::LEVEL_JSONAPI) {
 			throw new InputException('level "jsonapi" can not be used for links');
@@ -117,12 +116,24 @@ public function addLink($key, $href, array $meta=[], $level=Document::LEVEL_ROOT
 	/**
 	 * set the self link on the document
 	 * 
+	 * @note a LinkObject is added when extensions or profiles are applied
+	 * 
 	 * @param string $href
 	 * @param array  $meta optional, if given a LinkObject is added, otherwise a link string is added
 	 * @param string $level one of the Document::LEVEL_* constants, optional, defaults to Document::LEVEL_ROOT
 	 */
 	public function setSelfLink($href, array $meta=[], $level=Document::LEVEL_ROOT) {
-		$this->addLink('self', $href, $meta, $level);
+		if ($level === Document::LEVEL_ROOT && ($this->extensions !== [] || $this->profiles !== [])) {
+			$contentType = Converter::prepareContentType(Document::CONTENT_TYPE_OFFICIAL, $this->extensions, $this->profiles);
+			
+			$linkObject = new LinkObject($href, $meta);
+			$linkObject->setMediaType($contentType);
+			
+			$this->addLinkObject('self', $linkObject);
+		}
+		else {
+			$this->addLink('self', $href, $meta, $level);
+		}
 	}
 	
 	/**
diff --git a/tests/DocumentTest.php b/tests/DocumentTest.php
index 30043cb..020a70a 100644
--- a/tests/DocumentTest.php
+++ b/tests/DocumentTest.php
@@ -237,23 +237,33 @@ public function testAddLinkObject_HappyPath() {
 	public function testApplyExtension_HappyPath() {
 		$extension = new TestExtension();
 		$extension->setNamespace('test');
-		$extension->setOfficialLink('https://jsonapi.org');
+		$extension->setOfficialLink('https://jsonapi.org/extension');
 		
 		$document = new Document();
 		$document->applyExtension($extension);
 		$document->addExtensionMember($extension, 'foo', 'bar');
+		$document->setSelfLink('https://jsonapi.org/foo');
 		
 		$array = $document->toArray();
 		
+		$this->assertCount(3, $array);
 		$this->assertArrayHasKey('jsonapi', $array);
 		$this->assertCount(2, $array['jsonapi']);
 		$this->assertSame('1.1', $array['jsonapi']['version']);
 		$this->assertArrayHasKey('ext', $array['jsonapi']);
 		$this->assertCount(1, $array['jsonapi']['ext']);
 		$this->assertArrayHasKey(0, $array['jsonapi']['ext']);
-		$this->assertSame('https://jsonapi.org', $array['jsonapi']['ext'][0]);
+		$this->assertSame('https://jsonapi.org/extension', $array['jsonapi']['ext'][0]);
 		$this->assertArrayHasKey('test:foo', $array);
 		$this->assertSame('bar', $array['test:foo']);
+		$this->assertArrayHasKey('links', $array);
+		$this->assertCount(1, $array['links']);
+		$this->assertArrayHasKey('self', $array['links']);
+		$this->assertCount(2, $array['links']['self']);
+		$this->assertArrayHasKey('href', $array['links']['self']);
+		$this->assertArrayHasKey('type', $array['links']['self']);
+		$this->assertSame('https://jsonapi.org/foo', $array['links']['self']['href']);
+		$this->assertSame('application/vnd.api+json; ext="https://jsonapi.org/extension"', $array['links']['self']['type']);
 	}
 	
 	/**
@@ -298,20 +308,30 @@ public function testApplyExtension_ConflictingNamespace() {
 	 */
 	public function testApplyProfile_HappyPath() {
 		$profile = new TestProfile();
-		$profile->setOfficialLink('https://jsonapi.org');
+		$profile->setOfficialLink('https://jsonapi.org/profile');
 		
 		$document = new Document();
 		$document->applyProfile($profile);
+		$document->setSelfLink('https://jsonapi.org/foo');
 		
 		$array = $document->toArray();
 		
+		$this->assertCount(2, $array);
 		$this->assertArrayHasKey('jsonapi', $array);
 		$this->assertCount(2, $array['jsonapi']);
 		$this->assertSame('1.1', $array['jsonapi']['version']);
 		$this->assertArrayHasKey('profile', $array['jsonapi']);
 		$this->assertCount(1, $array['jsonapi']['profile']);
 		$this->assertArrayHasKey(0, $array['jsonapi']['profile']);
-		$this->assertSame('https://jsonapi.org', $array['jsonapi']['profile'][0]);
+		$this->assertSame('https://jsonapi.org/profile', $array['jsonapi']['profile'][0]);
+		$this->assertArrayHasKey('links', $array);
+		$this->assertCount(1, $array['links']);
+		$this->assertArrayHasKey('self', $array['links']);
+		$this->assertCount(2, $array['links']['self']);
+		$this->assertArrayHasKey('href', $array['links']['self']);
+		$this->assertArrayHasKey('type', $array['links']['self']);
+		$this->assertSame('https://jsonapi.org/foo', $array['links']['self']['href']);
+		$this->assertSame('application/vnd.api+json; profile="https://jsonapi.org/profile"', $array['links']['self']['type']);
 	}
 	
 	public function testToJson_HappyPath() {