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diff --git a/tor-spec.txt b/tor-spec.txt
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@@ -2175,6 +2175,11 @@ see tor-design.pdf.
matched on the other side from the previous cell sent that the OR/OP
must remember.
+ (Note that if the digest in use has an output length greater than 20
+ bytes—as is the case for the hop of an onion service rendezvous
+ circuit created by the hs_ntor handshake—we truncate the digest
+ to 20 bytes here.)
+
If the VERSION is unrecognized or below the minimum accepted version (taken
from the consensus), the circuit should be torn down.