diff --git a/lib/models/documents/attribute.dart b/lib/models/documents/attribute.dart
index 5351ae77..412d7a9c 100644
--- a/lib/models/documents/attribute.dart
+++ b/lib/models/documents/attribute.dart
@@ -7,22 +7,40 @@ enum AttributeScope {
 class Attribute<T> {
   final String key;
   final AttributeScope scope;
+  T value;
 
-  Attribute(this.key, this.scope);
+  Attribute(this.key, this.scope, this.value);
 }
 
 class BoldAttribute extends Attribute<bool> {
-  BoldAttribute() : super('bold', AttributeScope.INLINE);
+  BoldAttribute() : super('bold', AttributeScope.INLINE, null);
 }
 
 class ItalicAttribute extends Attribute<bool> {
-  ItalicAttribute() : super('italic', AttributeScope.INLINE);
+  ItalicAttribute() : super('italic', AttributeScope.INLINE, null);
 }
 
 class UnderlineAttribute extends Attribute<bool> {
-  UnderlineAttribute() : super('underline', AttributeScope.INLINE);
+  UnderlineAttribute() : super('underline', AttributeScope.INLINE, null);
 }
 
 class StrikeThroughAttribute extends Attribute<bool> {
-  StrikeThroughAttribute() : super('strike', AttributeScope.INLINE);
+  StrikeThroughAttribute() : super('strike', AttributeScope.INLINE, null);
+}
+
+class LinkAttribute extends Attribute<String> {
+  LinkAttribute() : super('link', AttributeScope.INLINE, null);
+}
+
+class HeaderAttribute extends Attribute<int> {
+  HeaderAttribute(int level) : super('header', AttributeScope.BLOCK, level);
+
+  // H1 in HTML
+  Attribute<int> get level1 => Attribute<int>(key, scope, 1);
+
+  // H2 in HTML
+  Attribute<int> get level2 => Attribute<int>(key, scope, 2);
+
+  // H3 in HTML
+  Attribute<int> get level3 => Attribute<int>(key, scope, 3);
 }