diff --git a/GLFW-4.0-sketchbook.md b/GLFW-4.0-sketchbook.md
index 330e699..b479123 100644
--- a/GLFW-4.0-sketchbook.md
+++ b/GLFW-4.0-sketchbook.md
@@ -13,6 +13,7 @@
 - Cleanup of signed vs. unsigned
 - Change default to compatibility profile
 - Possibly move to built-in config selection
+- Handle mouse button swapping
 - Rename joystick to controller
 - Rename `GLFW_CLIENT_API` to `GLFW_CONTEXT_TYPE`
 - Rename `glfwGetVersion` to `glfwGetLibraryVersion`