diff --git a/index-words b/index-words
index 70f63ab62..4d77839cc 100644
--- a/index-words
+++ b/index-words
@@ -367,6 +367,7 @@ RFC 2229
 RFC 2246
 RFC 2326
 RFC 2595
+RFC 2616
 RFC 2818
 RFC 3207
 RFC 3501