diff --git a/man2/mmap.2 b/man2/mmap.2
index 1b70a57c5..ff657c5c1 100644
--- a/man2/mmap.2
+++ b/man2/mmap.2
@@ -36,7 +36,7 @@
 .\" Modified 2006-12-04, mtk, various parts rewritten
 .\" 2007-07-10, mtk, Added an example program.
 .\"
-.TH MMAP 2 2008-05-05 "Linux" "Linux Programmer's Manual"
+.TH MMAP 2 2008-06-05 "Linux" "Linux Programmer's Manual"
 .SH NAME
 mmap, munmap \- map or unmap files or devices into memory
 .SH SYNOPSIS
@@ -481,6 +481,21 @@ or not.
 Portable programs should always set
 .B PROT_EXEC
 if they intend to execute code in the new mapping.
+
+The portable way to create a mapping is to specify
+.I addr
+as 0 (NULL), and omit
+.B MAP_FIXED
+from
+.IR flags .
+In this case, the system chooses the address for the mapping;
+the address is chosen so as not to conflict with any extant mapping,
+and will not be 0.
+If the
+.B MAP_FIXED
+flag is specified, and
+.I addr
+is 0 (NULL), then the mapped adddress will be 0 (NULL).
 .SH BUGS
 On Linux there are no guarantees like those suggested above under
 .BR MAP_NORESERVE .