diff --git a/man3/termios.3 b/man3/termios.3
index c96a5c15e..f888c15d7 100644
--- a/man3/termios.3
+++ b/man3/termios.3
@@ -1017,7 +1017,11 @@ which must be specified as one of the
 .BI B nnn
 constants listed above for
 .BR cfsetospeed ().
-If the input baud rate is set to zero, the input baud rate will be
+If the input baud rate is set to literal constant
+.B 0
+(not the symbolic constant
+.BR B0 ),
+the input baud rate will be
 equal to the output baud rate.
 .PP
 .BR cfsetspeed ()