diff --git a/TODO b/TODO
new file mode 100644
index 0000000..81391e4
--- /dev/null
+++ b/TODO
@@ -0,0 +1,16 @@
+TransmitFile
+http://msdn.microsoft.com/library/en-us/winsock/winsock/transmitfile_2.asp
+
+http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/base/i_o_completion_ports.asp
+
+http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/base/createiocompletionport.asp
+
+http://www.sysinternals.com/ntw2k/info/comport.shtml
+
+
+
+Solaris 9: http://docs.sun.com/db/doc/816-5218/6mbcj7nrr?q=sendfile&a=view
+
+HP-UX: http://docs.hp.com/hpux/onlinedocs/B9106-90009/00/01/168-con.html
+
+AIX: http://publib16.boulder.ibm.com/pseries/en_US/libs/commtrf2/send_file.htm
diff --git a/io/io_sendfile.c b/io/io_sendfile.c
index 92285fe..defc33a 100644
--- a/io/io_sendfile.c
+++ b/io/io_sendfile.c
@@ -1,3 +1,4 @@
+/* http://delegate.uec.ac.jp:8081/club/mma/~shimiz98/misc/sendfile.html */
 #define _FILE_OFFSET_BITS 64
 #include "io_internal.h"
 #include "havebsdsf.h"