diff --git a/man3/termios.3 b/man3/termios.3
index 9b7763a9c..c11937458 100644
--- a/man3/termios.3
+++ b/man3/termios.3
@@ -987,7 +987,9 @@ constant is defined prior to using it.
 The zero baud rate,
 .BR B0 ,
 is used to terminate the connection.
-If B0 is specified, the modem control lines shall no longer be asserted.
+If
+.B B0
+is specified, the modem control lines shall no longer be asserted.
 Normally, this will disconnect the line.
 .B CBAUDEX
 is a mask