diff --git a/src/BirdsiteLive.ActivityPub/Models/Actor.cs b/src/BirdsiteLive.ActivityPub/Models/Actor.cs
index 0552f25..886b862 100644
--- a/src/BirdsiteLive.ActivityPub/Models/Actor.cs
+++ b/src/BirdsiteLive.ActivityPub/Models/Actor.cs
@@ -23,5 +23,6 @@ namespace BirdsiteLive.ActivityPub
         public Image icon { get; set; }
         public Image image { get; set; }
         public EndPoints endpoints { get; set; }
+        public UserAttachment[] attachment { get; set; }
     }
 }
diff --git a/src/BirdsiteLive.ActivityPub/Models/UserAttachment.cs b/src/BirdsiteLive.ActivityPub/Models/UserAttachment.cs
new file mode 100644
index 0000000..1b7df37
--- /dev/null
+++ b/src/BirdsiteLive.ActivityPub/Models/UserAttachment.cs
@@ -0,0 +1,9 @@
+namespace BirdsiteLive.ActivityPub
+{
+    public class UserAttachment
+    {
+        public string type { get; set; }
+        public string name { get; set; }
+        public string value { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/src/BirdsiteLive.Domain/UserService.cs b/src/BirdsiteLive.Domain/UserService.cs
index c203977..549e0ea 100644
--- a/src/BirdsiteLive.Domain/UserService.cs
+++ b/src/BirdsiteLive.Domain/UserService.cs
@@ -75,6 +75,15 @@ namespace BirdsiteLive.Domain
                     mediaType = "image/jpeg",
                     url = twitterUser.ProfileBannerURL
                 },
+                attachment = new []
+                {
+                    new UserAttachment
+                    {
+                        type = "PropertyValue",
+                        name = "Official",
+                        value = $"<a href=\"https://twitter.com/{acct}\" rel=\"me nofollow noopener noreferrer\" target=\"_blank\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">twitter.com/{acct}</span></a>"
+                    }
+                },
                 endpoints = new EndPoints
                 {
                     sharedInbox = $"https://{_instanceSettings.Domain}/inbox"