diff --git a/man2/mmap2.2 b/man2/mmap2.2
index 6545a8f52..d579a285d 100644
--- a/man2/mmap2.2
+++ b/man2/mmap2.2
@@ -31,11 +31,13 @@
 mmap2 \- map files or devices into memory
 .SH SYNOPSIS
 .nf
-.B #include <sys/mman.h>
+.BR "#include <sys/mman.h>" "    /* Definition of " MAP_* " and " PROT_* " constants */"
+.BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */"
+.BR "#include <unistd.h>
 .PP
-.BI "void *mmap2(unsigned long " addr ", unsigned long " length ,
-.BI "            unsigned long " prot ", unsigned long " flags ,
-.BI "            unsigned long " fd ", unsigned long " pgoffset );
+.BI "void *syscall(SYS_mmap2, unsigned long " addr ", unsigned long " length ,
+.BI "              unsigned long " prot ", unsigned long " flags ,
+.BI "              unsigned long " fd ", unsigned long " pgoffset );
 .fi
 .SH DESCRIPTION
 This is probably not the system call that you are interested in; instead, see