diff --git a/Documentation/vm/00-INDEX b/Documentation/vm/00-INDEX
index 081c497..6a5e2a1 100644
--- a/Documentation/vm/00-INDEX
+++ b/Documentation/vm/00-INDEX
@@ -14,6 +14,8 @@
 	- a brief summary of hugetlbpage support in the Linux kernel.
 hwpoison.txt
 	- explains what hwpoison is
+idle_page_tracking.txt
+	- description of the idle page tracking feature.
 ksm.txt
 	- how to use the Kernel Samepage Merging feature.
 numa