diff --git a/man2/rename.2 b/man2/rename.2
index 0710357ef..53b26b589 100644
--- a/man2/rename.2
+++ b/man2/rename.2
@@ -65,7 +65,12 @@ _POSIX_C_SOURCE\ >=\ 200809L
 .TP
 Before glibc 2.10:
 _ATFILE_SOURCE
-.\" FIXME . need to define FTMs for renameat2(), once it hits glibc
+.RE
+.PP
+.BR renameat2 ():
+.RS 4
+.TP
+_GNU_SOURCE
 .RE
 .ad
 .PD