diff --git a/Documentation/kref.txt b/Documentation/kref.txt
index 96d8f56..42fe284 100644
--- a/Documentation/kref.txt
+++ b/Documentation/kref.txt
@@ -208,4 +208,9 @@
 
 Corey Minyard <minyard@acm.org>
 
-A lot of this was lifted from Greg KH's OLS presentation on krefs.
+A lot of this was lifted from Greg Kroah-Hartman's 2004 OLS paper and
+presentation on krefs, which can be found at:
+  http://www.kroah.com/linux/talks/ols_2004_kref_paper/Reprint-Kroah-Hartman-OLS2004.pdf
+and:
+  http://www.kroah.com/linux/talks/ols_2004_kref_talk/
+