diff --git a/man2/pkey_alloc.2 b/man2/pkey_alloc.2
index 558fb403c..1daf3b857 100644
--- a/man2/pkey_alloc.2
+++ b/man2/pkey_alloc.2
@@ -40,7 +40,7 @@ allocates a protection key (pkey) and allows it to be passed to
 The
 .BR pkey_alloc ()
 .I flags
-argument is still not supported and should be set to "0".
+is reserved for future use and currently must always be specified as 0.
 .PP
 The
 .BR pkey_alloc ()