diff --git a/man2/mmap.2 b/man2/mmap.2
index 4ed9f66ef..700d53dbd 100644
--- a/man2/mmap.2
+++ b/man2/mmap.2
@@ -230,7 +230,7 @@ should extend downward in memory.
 Allocate the mapping using "huge pages."
 See the Linux kernel source file
 .I Documentation/vm/hugetlbpage.txt
-for further information.
+for further information, as well as NOTES, below.
 .TP
 .BR MAP_HUGE_2MB ", " MAP_HUGE_1GB " (since Linux 3.8)"
 .\" See https://lwn.net/Articles/533499/
@@ -637,6 +637,29 @@ or
 .B MS_ASYNC
 flag, if one occurs.
 .\"
+.SS Huge page (Huge TLB) mappings
+For mappings that employ huge pages, the requirements for the arguments of
+.BR mmap ()
+and
+.BR munmap ()
+differ somewhat from the requirements for mappings
+that use the native system page size.
+
+For
+.BR mmap (),
+.I offset
+must be a multiple of the underlying huge page size.
+The system automatically aligns
+.I length
+to be a multiple of the underlying huge page size.
+
+For
+.BR munmap (),
+.I addr
+and
+.I length
+must both be a multiple of the underlying huge page size.
+.\"
 .SS C library/kernel differences
 This page describes the interface provided by the glibc
 .BR mmap ()