diff --git a/kernel/resource.c b/kernel/resource.c
index ca6a153..fd5d7d5 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -620,6 +620,7 @@
  * @start: resource start address
  * @n: resource region size
  * @name: reserving caller's ID string
+ * @flags: IO resource flags
  */
 struct resource * __request_region(struct resource *parent,
 				   resource_size_t start, resource_size_t n,