diff --git a/headers/private/system/arch/m68k/arch_commpage_defs.h b/headers/private/system/arch/m68k/arch_commpage_defs.h
index 7fb98b76c6..47aa7322f1 100644
--- a/headers/private/system/arch/m68k/arch_commpage_defs.h
+++ b/headers/private/system/arch/m68k/arch_commpage_defs.h
@@ -12,6 +12,7 @@
 #define COMMPAGE_ENTRY_M68K_SYSCALL	(COMMPAGE_ENTRY_FIRST_ARCH_SPECIFIC + 0)
 #define COMMPAGE_ENTRY_M68K_MEMCPY	(COMMPAGE_ENTRY_FIRST_ARCH_SPECIFIC + 1)
 
+#warning M68K: FIXME: colides with IO space mapped with TT1!
 #define ARCH_USER_COMMPAGE_ADDR (0xffff0000)
 
 #endif	/* _SYSTEM_ARCH_M68K_COMMPAGE_DEFS_H */