diff --git a/man2/fallocate.2 b/man2/fallocate.2
index 42eefbd82..97e387737 100644
--- a/man2/fallocate.2
+++ b/man2/fallocate.2
@@ -2,6 +2,8 @@
 .\" Written by Dave Chinner <dgc@sgi.com>
 .\" May be distributed as per GNU General Public License version 2.
 .\"
+.\" FIXME: Linux 2.6.38 added FALLOC_FL_PUNCH_HOLE
+.\"
 .TH FALLOCATE 2 2010-09-10 "Linux" "Linux Programmer's Manual"
 .SH NAME
 fallocate \- manipulate file space