diff --git a/nestsClient/src/commonMain/kotlin/com/vitorpamplona/nestsclient/moq/lite/MoqLiteMessages.kt b/nestsClient/src/commonMain/kotlin/com/vitorpamplona/nestsclient/moq/lite/MoqLiteMessages.kt
index 59d8af06d..b55f2e0ee 100644
--- a/nestsClient/src/commonMain/kotlin/com/vitorpamplona/nestsclient/moq/lite/MoqLiteMessages.kt
+++ b/nestsClient/src/commonMain/kotlin/com/vitorpamplona/nestsclient/moq/lite/MoqLiteMessages.kt
@@ -21,22 +21,38 @@
 package com.vitorpamplona.nestsclient.moq.lite
 
 /**
- * moq-lite ALPN strings. The on-the-wire framing for Subscribe / Group
- * / Announce did NOT change between Lite-03 and Lite-04, so advertising
- * both via `wt-available-protocols` is safe — the relay picks whichever
- * it prefers and our existing codec paths handle either. We keep 03 in
- * the list as the previously-tested target until the production relay's
- * Lite-04 path has interop coverage.
+ * moq-lite ALPN strings. ONLY [LITE_03] is wire-compatible with the
+ * codec in [MoqLiteCodec]; the other constants are kept for
+ * documentation and future codec upgrades.
+ *
+ * Subscribe / Group framing is identical across Lite-03 and Lite-04,
+ * but Lite-04 reshapes Announce.hops into an `OriginList`
+ * (`kixelated/moq` commit 45db108, "moq-lite/moq-relay: hop-based
+ * clustering"), adds an `exclude_hop` field to AnnounceInterest, and
+ * adds an `rtt` field to Probe. A relay that picks Lite-04 with our
+ * Lite-03 codec on the wire desyncs on the first Announce exchange.
+ * Don't add [LITE_04] to `wt-available-protocols` until
+ * [MoqLiteCodec] is version-aware and [MoqLiteAnnounce.hops] is a
+ * list rather than a single varint.
  *
  * `"moql"` is the legacy combined ALPN that requires an in-band SETUP
  * exchange — kept here for completeness; not advertised by the
  * factory.
  *
- * Source: `kixelated/moq-rs/rs/moq-lite/src/version.rs:21-26`,
- * `@moq/lite/connection/connect.js:277`.
+ * Source: `kixelated/moq/rs/moq-lite/src/lite/version.rs`,
+ * `kixelated/moq/rs/moq-lite/src/lite/announce.rs:11-105`,
+ * `kixelated/moq/rs/moq-lite/src/lite/probe.rs:9-55`.
  */
 object MoqLiteAlpn {
     const val LITE_03: String = "moq-lite-03"
+
+    /**
+     * `moq-lite-04` ALPN string. Wire-incompatible with [MoqLiteCodec]
+     * today — see the object kdoc for the codec diff. Defined here so
+     * a future patch that lands version-aware Announce / Probe codecs
+     * can drop it into the [QuicWebTransportFactory] sub-protocol list
+     * without re-deriving the constant.
+     */
     const val LITE_04: String = "moq-lite-04"
     const val LEGACY: String = "moql"
 }
diff --git a/nestsClient/src/jvmAndroid/kotlin/com/vitorpamplona/nestsclient/transport/QuicWebTransportFactory.kt b/nestsClient/src/jvmAndroid/kotlin/com/vitorpamplona/nestsclient/transport/QuicWebTransportFactory.kt
index f305fc24c..4f5fe7e59 100644
--- a/nestsClient/src/jvmAndroid/kotlin/com/vitorpamplona/nestsclient/transport/QuicWebTransportFactory.kt
+++ b/nestsClient/src/jvmAndroid/kotlin/com/vitorpamplona/nestsclient/transport/QuicWebTransportFactory.kt
@@ -91,18 +91,26 @@ class QuicWebTransportFactory(
      * `connection closed err=invalid value` on the relay side and a stalled
      * subscribe / `subscribe stream FIN before reply` on the client side.
      *
-     * `moq-lite-04` is also advertised because the production relay
-     * (moq.nostrnests.com) and the kixelated browser client both ship
-     * Lite-04 now; without it in our list a Lite-04-only deployment
-     * would refuse the CONNECT. The on-the-wire framing for Subscribe /
-     * Group / Announce did NOT change between Lite-03 and Lite-04, so
-     * our existing codec handles either selection. List `moq-lite-03`
-     * first because it's our previously-tested negotiation target —
-     * a relay that supports both should pick the listed-first option,
-     * and a Lite-04-only relay falls through to the second entry.
+     * **Lite-04 is intentionally NOT advertised** even though the kixelated
+     * browser client now ships it. Lite-04 reshapes the on-the-wire
+     * Announce.hops field from a single varint count into a full
+     * `OriginList` (`kixelated/moq` commit 45db108, "moq-lite/moq-relay:
+     * hop-based clustering"), adds an `exclude_hop` field to
+     * AnnounceInterest, and adds an `rtt` field to Probe — Subscribe and
+     * Group framing are unchanged but Announce framing diverges. Our codec
+     * speaks pure Lite-03; if a Lite-04-preferring relay picks
+     * `moq-lite-04` from our advertised list, the very first Announce
+     * exchange would desync (we'd encode/read a bare hops varint where
+     * the peer expects `len + len × u62`) and the connection would abort.
+     * Until [com.vitorpamplona.nestsclient.moq.lite.MoqLiteCodec] gains
+     * version-aware Announce / AnnounceInterest / Probe paths and
+     * [com.vitorpamplona.nestsclient.moq.lite.MoqLiteAnnounce.hops]
+     * becomes a list, advertising Lite-04 is a footgun. See
+     * [com.vitorpamplona.nestsclient.moq.lite.MoqLiteAlpn] for the
+     * known-version constants.
      */
     private val webTransportSubProtocols: List<String> =
-        listOf(MoqLiteAlpn.LITE_03, MoqLiteAlpn.LITE_04),
+        listOf(MoqLiteAlpn.LITE_03),
 ) : WebTransportFactory {
     override suspend fun connect(
         authority: String,