[PATCH v16 11/11] include: Add a comment explaining why all kernel callbacks must be in user32.

[Torge Matthies]

From: Torge Matthies

Signed-off-by: Torge Matthies 
---
 include/ntuser.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/ntuser.h b/include/ntuser.h
index 39ffad66986..2db91e2adbd 100644
--- a/include/ntuser.h
+++ b/include/ntuser.h
@@ -24,7 +24,10 @@
 #include <imm.h>
 #include <winternl.h>

-/* KernelCallbackTable codes, not compatible with Windows */
+/* KernelCallbackTable codes, not compatible with Windows.
+   All of these functions must live inside user32.dll. Overwatch 2's
+   KiUserCallbackDispatcher hook verifies this and prevents the callback from
+   running if that check fails. */
 enum
 {
     /* user32 callbacks */