diff --git a/man3/getgrent.3 b/man3/getgrent.3
index 462353923..bb2dd970f 100644
--- a/man3/getgrent.3
+++ b/man3/getgrent.3
@@ -45,13 +45,23 @@ Feature Test Macro Requirements for glibc (see
 .BR feature_test_macros (7)):
 .in
 .sp
+.PD 0
 .ad l
-.BR getgrent (),
 .BR setgrent (),
+.RS 4
+_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500 ||
+_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED ||
+.br
+/* Since glibc 2.12: */ _POSIX_C_SOURCE\ >=\ 200809L
+.RE
+.sp
+.BR getgrent (),
 .BR endgrent ():
 .RS 4
-_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
+_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500 ||
+_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
 .RE
+.PD
 .ad b
 .SH DESCRIPTION
 The