diff --git a/src/service/chat.rs b/src/service/chat.rs
index 076e987..d968e2b 100644
--- a/src/service/chat.rs
+++ b/src/service/chat.rs
@@ -28,8 +28,9 @@ pub type ChatArgs = (Function, String, bool);
 pub struct Chat {
 	pub tx: Sender<ChatArgs>,
 	to_interrupt: ArtBool,
-	// TODO?: get rid of the `Mutex`.
+	// TODO: https://github.com/hack-ink/AiR/issues/117.
 	openai: Arc<Mutex<OpenAi>>,
+	// TODO: https://github.com/hack-ink/AiR/issues/117.
 	chat_setting: Arc<Mutex<ChatSetting>>,
 	abort_handle: AbortHandle,
 }
diff --git a/src/service/hotkey.rs b/src/service/hotkey.rs
index 433ba8e..503ad9a 100644
--- a/src/service/hotkey.rs
+++ b/src/service/hotkey.rs
@@ -23,6 +23,7 @@ use crate::{
 pub struct Hotkey {
 	// The global hokey manager need to be kept alive during the whole program life.
 	ghk: GlobalHotKeyManager,
+	// TODO: https://github.com/hack-ink/AiR/issues/117.
 	inner: Arc<RwLock<Manager>>,
 	abort: ArtBool,
 }