diff --git a/man2/chmod.2 b/man2/chmod.2
index 161e11b4b..1116a022b 100644
--- a/man2/chmod.2
+++ b/man2/chmod.2
@@ -56,6 +56,10 @@ Feature Test Macro Requirements for glibc (see
 .PD 0
 .BR fchmod ():
 .RS 4
+Since glibc 2.24:
+    _POSIX_C_SOURCE\ >=\ 199309L
+.\"        || (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
+.PP
 Glibc 2.19 to 2.23
     _POSIX_C_SOURCE
 .PP