This should have a [2002] suffix.<p>A closely related contemporary document, talking about the then-new use of one of the reserved bits for Explicit Congestion Notification (ECN): <a href="http:&#x2F;&#x2F;www.icir.org&#x2F;floyd&#x2F;ecn.html" rel="nofollow">http:&#x2F;&#x2F;www.icir.org&#x2F;floyd&#x2F;ecn.html</a>