diff --git a/backend/forum.py b/backend/forum.py
index 603f37c..e5b39a1 100644
--- a/backend/forum.py
+++ b/backend/forum.py
@@ -23,13 +23,16 @@ class PostCreate(BaseModel):
 class Thread:
     id: int
     title: str
+    closed: bool
 
-    def __init__(self, id, title):
+    def __init__(self, id, title, closed=False):
         self.id = id
         self.title = title
+        self.closed = closed
 
 
 POSTS = []
+THREADS = []
 
 
 @app.get("/")