Zero on send, ignored on receipt

quicwg · May 30, 2018 · a6d2443 · a6d2443
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commit a6d2443
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/draft-ietf-quic-http.md b/draft-ietf-quic-http.md
@@ -609,6 +609,9 @@ The PRIORITY frame payload has the following fields:
     : Indicates that the stream dependency is exclusive (see {{!RFC7540}},
       Section 5.3).
 
+    Undefined bits in the Flags field MUST be zero when sent, and ignored upon
+    receipt.
+
   Prioritized Request ID:
   : A variable-length integer that identifies a request.  This contains
     the Stream ID of a request stream when the PUSH_PRIORITIZED flag is clear,