From f5ddaef04c1a14a81ede65245142687eb140ee13 Mon Sep 17 00:00:00 2001
From: Damien Elmes <dae@users.noreply.github.com>
Date: Sat, 21 Dec 2019 16:44:38 +1000
Subject: [PATCH] add type hint

---
 aqt/browser.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/aqt/browser.py b/aqt/browser.py
index 75d5eaf62..91a596252 100644
--- a/aqt/browser.py
+++ b/aqt/browser.py
@@ -394,7 +394,7 @@ class SidebarItem:
         self.expanded = expanded
         self.children: List["SidebarItem"] = []
         self.parentItem: Optional[SidebarItem] = None
-        self.tooltip = None
+        self.tooltip: Optional[str] = None
 
     def addChild(self, cb: "SidebarItem") -> None:
         self.children.append(cb)