diff --git a/lib/src/models/documents/attribute.dart b/lib/src/models/documents/attribute.dart
index 284cf580..2585e8b7 100644
--- a/lib/src/models/documents/attribute.dart
+++ b/lib/src/models/documents/attribute.dart
@@ -50,11 +50,9 @@ class Attribute<T> {
 
   static const BoldAttribute bold = BoldAttribute();
 
-  static final ScriptAttribute subscript =
-      ScriptAttribute(ScriptAttributes.sub);
+  static final ScriptAttribute subscript = ScriptAttribute(ScriptAttributes.sub);
 
-  static final ScriptAttribute superscript =
-      ScriptAttribute(ScriptAttributes.sup);
+  static final ScriptAttribute superscript = ScriptAttribute(ScriptAttributes.sup);
 
   static const ItalicAttribute italic = ItalicAttribute();
 
@@ -116,6 +114,8 @@ class Attribute<T> {
 
   static const MentionAttribute mention = MentionAttribute(null);
 
+  static const MentionAllAttribute mentionAll = MentionAllAttribute(null);
+
   static const VideoAttribute video = VideoAttribute(null);
 
   static final Set<String> inlineKeys = {
@@ -163,6 +163,7 @@ class Attribute<T> {
     Attribute.video.key,
     Attribute.file.key,
     Attribute.mention.key,
+    Attribute.mentionAll.key,
   };
 
   static const Attribute<int?> h1 = HeaderAttribute(level: 1);
@@ -256,9 +257,7 @@ class Attribute<T> {
     if (identical(this, other)) return true;
     if (other is! Attribute) return false;
     final typedOther = other;
-    return key == typedOther.key &&
-        scope == typedOther.scope &&
-        value == typedOther.value;
+    return key == typedOther.key && scope == typedOther.scope && value == typedOther.value;
   }
 
   @override
@@ -307,29 +306,24 @@ class LinkAttribute extends Attribute<String?> {
 }
 
 class ColorAttribute extends Attribute<String?> {
-  const ColorAttribute(String? val)
-      : super('color', AttributeScope.INLINE, val);
+  const ColorAttribute(String? val) : super('color', AttributeScope.INLINE, val);
 }
 
 class BackgroundAttribute extends Attribute<String?> {
-  const BackgroundAttribute(String? val)
-      : super('background', AttributeScope.INLINE, val);
+  const BackgroundAttribute(String? val) : super('background', AttributeScope.INLINE, val);
 }
 
 /// This is custom attribute for hint
 class PlaceholderAttribute extends Attribute<bool> {
-  const PlaceholderAttribute()
-      : super('placeholder', AttributeScope.INLINE, true);
+  const PlaceholderAttribute() : super('placeholder', AttributeScope.INLINE, true);
 }
 
 class HeaderAttribute extends Attribute<int?> {
-  const HeaderAttribute({int? level})
-      : super('header', AttributeScope.BLOCK, level);
+  const HeaderAttribute({int? level}) : super('header', AttributeScope.BLOCK, level);
 }
 
 class IndentAttribute extends Attribute<int?> {
-  const IndentAttribute({int? level})
-      : super('indent', AttributeScope.BLOCK, level);
+  const IndentAttribute({int? level}) : super('indent', AttributeScope.BLOCK, level);
 }
 
 class AlignAttribute extends Attribute<String?> {
@@ -349,23 +343,19 @@ class BlockQuoteAttribute extends Attribute<bool> {
 }
 
 class DirectionAttribute extends Attribute<String?> {
-  const DirectionAttribute(String? val)
-      : super('direction', AttributeScope.BLOCK, val);
+  const DirectionAttribute(String? val) : super('direction', AttributeScope.BLOCK, val);
 }
 
 class WidthAttribute extends Attribute<String?> {
-  const WidthAttribute(String? val)
-      : super('width', AttributeScope.IGNORE, val);
+  const WidthAttribute(String? val) : super('width', AttributeScope.IGNORE, val);
 }
 
 class HeightAttribute extends Attribute<String?> {
-  const HeightAttribute(String? val)
-      : super('height', AttributeScope.IGNORE, val);
+  const HeightAttribute(String? val) : super('height', AttributeScope.IGNORE, val);
 }
 
 class StyleAttribute extends Attribute<String?> {
-  const StyleAttribute(String? val)
-      : super('style', AttributeScope.IGNORE, val);
+  const StyleAttribute(String? val) : super('style', AttributeScope.IGNORE, val);
 }
 
 class TokenAttribute extends Attribute<String> {
@@ -373,8 +363,7 @@ class TokenAttribute extends Attribute<String> {
 }
 
 class ScriptAttribute extends Attribute<String?> {
-  ScriptAttribute(ScriptAttributes? val)
-      : super('script', AttributeScope.INLINE, val?.value);
+  ScriptAttribute(ScriptAttributes? val) : super('script', AttributeScope.INLINE, val?.value);
 }
 
 enum ScriptAttributes {
@@ -387,21 +376,21 @@ enum ScriptAttributes {
 }
 
 class ImageAttribute extends Attribute<String?> {
-  const ImageAttribute(String? url)
-      : super('img', AttributeScope.EMBEDS, url);
+  const ImageAttribute(String? url) : super('img', AttributeScope.EMBEDS, url);
 }
 
 class VideoAttribute extends Attribute<String?> {
-  const VideoAttribute(String? url)
-      : super('video', AttributeScope.EMBEDS, url);
+  const VideoAttribute(String? url) : super('video', AttributeScope.EMBEDS, url);
 }
 
 class FileAttribute extends Attribute<String?> {
-  const FileAttribute(String? url)
-      : super('file', AttributeScope.EMBEDS, url);
+  const FileAttribute(String? url) : super('file', AttributeScope.EMBEDS, url);
 }
 
 class MentionAttribute extends Attribute<String?> {
-  const MentionAttribute(String? url)
-      : super('mention', AttributeScope.EMBEDS, url);
+  const MentionAttribute(String? url) : super('mention', AttributeScope.EMBEDS, url);
+}
+
+class MentionAllAttribute extends Attribute<String?> {
+  const MentionAllAttribute(String? url) : super('mention_all', AttributeScope.EMBEDS, url);
 }