diff --git a/man2/timer_create.2 b/man2/timer_create.2
index 7f81914c2..9d3534570 100644
--- a/man2/timer_create.2
+++ b/man2/timer_create.2
@@ -28,7 +28,7 @@
 timer_create \- create a POSIX per-process timer
 .SH SYNOPSIS
 .nf
-.B  #include <signal.h>
+.BR "#include <signal.h>" "           /* Definition of " SIGEV_* " constants */"
 .B  #include <time.h>
 .PP
 .BI "int timer_create(clockid_t " clockid ", struct sigevent *restrict " sevp ,