---
doc/posix-functions/tzset.texi | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/doc/posix-functions/tzset.texi b/doc/posix-functions/tzset.texi
index 0e4b0daf86..cacd685b66 100644
--- a/doc/posix-functions/tzset.texi
+++ b/doc/posix-functions/tzset.texi
@@ -28,5 +28,8 @@ applications built via the Universal Windows Platform, as it
does not
make environment variables like @env{TZ} available to applications.
@item
Older POSIX platforms do not support angle brackets in @env{TZ} values,
-as this feature was added in IEEE Std 1003.1-2001.
+as this feature was not implemented until some years after
+it was added to IEEE Std 1003.1-2001:
+glibc 2.9, Cygwin 1.7.30, FreeBSD 10.3, NetBSD 7.1, OpenBSD 4.4, OS X 10.8,
+AIX 6, Android 7, unpatched Solaris 10.
@end itemize
--
2.53.0
