diff --git a/PROTOCOL.md b/PROTOCOL.md
index 2d020ad..29de912 100644
--- a/PROTOCOL.md
+++ b/PROTOCOL.md
@@ -70,7 +70,11 @@ party had fixed in it. No transaction on chipnet carried more than one.)*
    from. Independent transactions keep the `txid` tiebreak. *(See "Ordering"
    below — this rule is load-bearing, added 2026-07-26.)*
 3. `REG`: valid if the same tx mints a certificate whose commitment matches the name
-   and the name is not yet taken. **First valid REG wins.** The certificate
+   and the name is not yet taken. **First valid REG wins** — with one
+   refinement since 2026-10-05: a `REG` may be the reveal of an earlier `CMT`
+   (it carries the salt `s`), and for six blocks after a name's first valid
+   `REG` one with an older commit takes the name instead. Optional on chipnet,
+   required on mainnet. See `PROTOCOL-ADDENDUM-commit-reveal.md` §0. The certificate
    must be the **only token of its category**: the category is created by
    this transaction (it spends, at output index 0, the outpoint whose txid is
    the category), exactly one output carries it, and that output is an NFT