diff --git a/man2/wait4.2 b/man2/wait4.2
index 60424879b..785747b78 100644
--- a/man2/wait4.2
+++ b/man2/wait4.2
@@ -54,7 +54,11 @@ Feature Test Macro Requirements for glibc (see
 .PP
 .ad l
 .BR wait3 ():
-    Since glibc 2.19:
+    Since glibc 2.26:
+        _DEFAULT_SOURCE ||
+        (_XOPEN_SOURCE\ >=\ 500 &&
+                ! (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600))
+    From glibc 2.19 to 2.25:
         _DEFAULT_SOURCE || _XOPEN_SOURCE\ >=\ 500
     Glibc 2.19 and earlier:
         _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500