diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index be2754841369..4aba4c86c626 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -124,6 +124,8 @@ struct vm_area_struct;
  *
  * Reclaim modifiers
  * ~~~~~~~~~~~~~~~~~
+ * Please note that all the following flags are only applicable to sleepable
+ * allocations (e.g. %GFP_NOWAIT and %GFP_ATOMIC will ignore them).
  *
  * %__GFP_IO can start physical IO.
  *