diff --git a/documentation/content/en/books/handbook/network/_index.adoc b/documentation/content/en/books/handbook/network/_index.adoc
--- a/documentation/content/en/books/handbook/network/_index.adoc
+++ b/documentation/content/en/books/handbook/network/_index.adoc
@@ -469,7 +469,7 @@
 |All global unicast addresses are assigned from this pool. The first 3 bits are `001`.
 |===
 
-For further information on the structure of IPv6 addresses, refer to http://www.ietf.org/rfc/rfc3513.txt[RFC3513].
+For further information on the structure of IPv6 addresses, refer to http://www.ietf.org/rfc/rfc4291.txt[RFC4291].
 
 [[config-static-ip-v6]]
 === Configuring Static IPv6 Address