Index: lib/libc/sys/write.2
===================================================================
--- lib/libc/sys/write.2
+++ lib/libc/sys/write.2
@@ -298,3 +298,18 @@
 .Fn write
 function appeared in
 .At v1 .
+.Sh BUGS
+The
+.Fn pwrite
+system call appends the file without changing the file offset if
+.Dv O_APPEND
+is set,
+contrary to
+.St -p1003.1-2008
+where
+.Fn pwrite
+writes into
+.Fa offset
+regardless of whether
+.Dv O_APPEND
+is set.