diff --git a/src/app/browser/window/tab.rs b/src/app/browser/window/tab.rs
index f6f3a26f..877c9476 100644
--- a/src/app/browser/window/tab.rs
+++ b/src/app/browser/window/tab.rs
@@ -15,6 +15,7 @@ use gtk::{
 
 use std::{cell::RefCell, collections::HashMap, sync::Arc};
 
+// Common struct for HashMap index
 struct TabItem {
     label: Arc<Label>,
     page: Arc<Page>,