diff -Nur linux-4.1.5/Documentation/ABI/testing/debugfs-aufs linux-4.1.5-pck/Documentation/ABI/testing/debugfs-aufs
--- linux-4.1.5/Documentation/ABI/testing/debugfs-aufs	1969-12-31 21:00:00.000000000 -0300
+++ linux-4.1.5-pck/Documentation/ABI/testing/debugfs-aufs	2015-08-13 01:24:18.076236442 -0300
@@ -0,0 +1,50 @@
+What:		/debug/aufs/si_<id>/
+Date:		March 2009
+Contact:	J. R. Okajima <hooanon05g@gmail.com>
+Description:
+		Under /debug/aufs, a directory named si_<id> is created
+		per aufs mount, where