diff --git a/man2/rt_sigqueueinfo.2 b/man2/rt_sigqueueinfo.2
index 2dd1a5877..d48ecbdcd 100644
--- a/man2/rt_sigqueueinfo.2
+++ b/man2/rt_sigqueueinfo.2
@@ -27,9 +27,14 @@
 rt_sigqueueinfo, rt_tgsigqueueinfo \- queue a signal and data
 .SH SYNOPSIS
 .nf
-.BI "int rt_sigqueueinfo(pid_t " tgid ", int " sig ", siginfo_t *" info );
-.BI "int rt_tgsigqueueinfo(pid_t " tgid ", pid_t " tid ", int " sig \
-", siginfo_t *" info );
+.BR "#include <linux/signal.h>" "     /* Definition of " SI_* " constants */"
+.BR "#include <sys/syscall.h>" "      /* Definition of " SYS_* " constants */"
+.B #include <unistd.h>
+.PP
+.BI "int syscall(SYS_rt_sigqueueinfo, pid_t " tgid ,
+.BI "            int " sig ", siginfo_t *" info );
+.BI "int syscall(SYS_rt_tgsigqueueinfo, pid_t " tgid ", pid_t " tid ,
+.BI "            int " sig ", siginfo_t *" info );
 .fi
 .PP
 .IR Note :