diff --git a/README.md b/README.md
index 88c2ca99..55961e57 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,10 @@ flatpak install --user flathub org.freedesktop.Platform.GL.nvidia-545-29-02/x86_
 flatpak install --user flathub org.freedesktop.Platform.GL32.nvidia-545-29-02/x86_64
 ```
 
+## Why no Alt1 Toolkit?
+
+The Alt1 Toolkit uses child window rendering that isn't yet supported by Wine. See [this issue](https://bugs.winehq.org/show_bug.cgi?id=45277) for more information.
+
 ## Why this Flatpak as opposed to other available options?
 
 ### <https://github.com/nmlynch94/com.jagexlauncher.JagexLauncher>