Index: kernel/generic/include/proc/thread.h
===================================================================
--- kernel/generic/include/proc/thread.h	(revision f74bbaf20e8d8be55495c56affc5b17ef6ea2bf0)
+++ kernel/generic/include/proc/thread.h	(revision 51ec40fa633067000ae92bcd7b38fde49fdfe205)
@@ -54,5 +54,9 @@
 /* Thread flags */
 
-/** Thread cannot be migrated to another CPU. */
+/** Thread cannot be migrated to another CPU.
+ *
+ * When using this flag, the caller must set cpu in the thread_t
+ * structure manually before calling thread_ready (even on uniprocessor).
+ */ 
 #define THREAD_FLAG_WIRED	(1 << 0)
 /** Thread was migrated to another CPU and has not run yet. */