diff --git a/headers/private/kernel/real_time_data.h b/headers/private/kernel/real_time_data.h
index 33885fa1a7..e889996d93 100644
--- a/headers/private/kernel/real_time_data.h
+++ b/headers/private/kernel/real_time_data.h
@@ -9,6 +9,9 @@
 #include <SupportDefs.h>
 
 
+// ToDo: most of this is probably arch dependent. When the PPC port comes
+//	to this, it should be properly separated and moved into the arch tree.
+
 struct real_time_data {
 	uint64	boot_time;
 	uint32	system_time_conversion_factor;