diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index c6bcfa07eb1..665baa9dcf3 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -1020,8 +1020,13 @@ vm_page_cache_transfer(vm_object_t orig_object, vm_pindex_t offidxstart,
  *	VM_ALLOC_SYSTEM		system *really* needs a page
  *	VM_ALLOC_INTERRUPT	interrupt time request
  *	VM_ALLOC_ZERO		zero page
+ *	VM_ALLOC_WIRED		wire the allocated page
+ *	VM_ALLOC_NOOBJ		page is not associated with a vm object
+ *	VM_ALLOC_NOBUSY		do not set the page busy
+ *	VM_ALLOC_IFNOTCACHED	return NULL, do not reactivate if the page
+ *				is cached
  *
- *	This routine may not block.
+ *	This routine may not sleep.
  */
 vm_page_t
 vm_page_alloc(vm_object_t object, vm_pindex_t pindex, int req)