diff --git a/schema.yaml b/schema.yaml
index be8d3e9..c1cc726 100644
--- a/schema.yaml
+++ b/schema.yaml
@@ -174,6 +174,15 @@ _atag-bare: &atag-bare
               type: pubkey
     - *ptag
 
+11:
+  description: Thread
+  content: free
+  tags:
+    -
+      name: title
+      next:
+        type: free
+
 13:
   description: Seal
   content: free