printf.3: Document nonstandard 'Z' modifier

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man3/printf.3 b/man3/printf.3
index 8f58a769b9b71db8d4d8349234f447588e8a8745..e216791bc11a89791416406f7cb12005cdf65b2b 100644 (file)
--- a/man3/printf.3
+++ b/man3/printf.3
@@ -554,10 +554,13 @@ argument, or a following
 conversion corresponds to a pointer to a
 .I size_t
 argument.
-.\" (Linux libc5 has
-.\" .B Z
-.\" with this meaning.
-.\" Don't use it.)
+.TP
+.B Z
+A nonstandard synonym for
+.BR z
+that predates the appearance of
+.BR z .
+Do not use in new code.
 .TP
 .B t
 A following integer conversion corresponds to a