diff --git a/anchor/README.md b/anchor/README.md
index 385a30c..f8323e6 100644
--- a/anchor/README.md
+++ b/anchor/README.md
@@ -189,10 +189,22 @@ sentence. Someone else has to do the verifying, which is why it is here.
 
 ## Terminology, used precisely
 
-**A certificate here is signed by f+1 validators, not by a quorum.** With f Byzantine faults
-tolerated, f+1 signatures guarantee that at least one honest validator signed. That is a real
-property and it is not the same as a quorum, and we do not call it one. Anyone counting will notice,
-and they should.
+**A certificate at an anchor height is signed by a quorum of six of nine validators, since block
+14,961,456 (August 21, 2026). It was f+1 before that, and this paragraph said so.** The distinction
+is worth keeping in view rather than deleting, because it is the difference between two genuinely
+different claims. f+1 signatures guarantee only that at least one honest validator signed. A quorum
+of 2f+1 is the same count QBFT itself requires to agree on the block, so from 14,961,456 the
+post-quantum certificate at an anchor height is backed by as many validators as the block itself.
+
+Two things follow, and both should be said rather than left to be discovered. The word "quorum"
+applies **only at anchor heights** - about every 32nd block; the blocks between them carry no Falcon
+seals at all and are finalized by ECDSA alone, so "a post-quantum quorum on every block" would be
+false. And the higher threshold costs liveness margin: at K=6 of nine, three late validators are
+enough to stall an anchor block, where K=3 tolerated six. That trade was made deliberately, and it
+is the reason the threshold is a configured schedule rather than a constant.
+
+Anyone counting will notice which of the two regimes a given height falls in, and they should. The
+schedule is in the header of this document and on every node.
 
 The seal threshold is a **floor, not a cap**: nodes attach as many verified seals as arrive in time,
 which is at least the threshold and often more. A separate cap bounds how many are written, because