diff --git a/src/requests/pin_chat_message.rs b/src/requests/pin_chat_message.rs
index 8f8a955c..5b9ddfde 100644
--- a/src/requests/pin_chat_message.rs
+++ b/src/requests/pin_chat_message.rs
@@ -30,7 +30,7 @@ impl<'a> PinChatMessage<'a> {
 }
 
 impl<'a> Request<'a> for PinChatMessage<'a> {
-    type ReturnValue = bool;
+    type ReturnValue = bool; // TODO: change to unit type True
 
     fn send(self) -> RequestFuture<'a, ResponseResult<Self::ReturnValue>> {
         Box::pin(async move {