diff --git a/TODO.md b/TODO.md
index 6463292d..3bcc4204 100644
--- a/TODO.md
+++ b/TODO.md
@@ -53,6 +53,7 @@ https://zhuanlan.zhihu.com/p/33778843
     - Group dropdown button layout incorrectly while resizing
   - [ ] Enforce extra click for dropdown buttons in a collapsed-state group dropdown menu
   - [ ] Ribbon tab cannot drag to short enough
+- [ ] `<InnerShadow>` renders nothing instead of crashes under GDI
 - [ ] **Update Release**
 - [ ] RTF / HTML clipboard format for document viewer
 - [ ] Demo: DocumentEditor