diff --git a/core/sys/windows/key_codes.odin b/core/sys/windows/key_codes.odin
index 2f6e01116..284b0e437 100644
--- a/core/sys/windows/key_codes.odin
+++ b/core/sys/windows/key_codes.odin
@@ -1,6 +1,14 @@
 // +build windows
 package sys_windows
 
+// https://docs.microsoft.com/en-us/windows/win32/inputdev/about-keyboard-input
+KF_EXTENDED :: 0x0100
+KF_DLGMODE :: 0x0800
+KF_MENUMODE :: 0x1000
+KF_ALTDOWN :: 0x2000
+KF_REPEAT :: 0x4000
+KF_UP :: 0x8000
+
 // https://docs.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes
 // Virtual Keys, Standard Set
 VK_LBUTTON  :: 0x01