diff --git a/src/interscript/ml/registry.py b/src/interscript/ml/registry.py
index 5f9185c..a7c0fb8 100644
--- a/src/interscript/ml/registry.py
+++ b/src/interscript/ml/registry.py
@@ -21,7 +21,7 @@
 import yaml
 
 DEFAULT_INDEX_URL = (
-    "https://github.com/interscript/interscript-models/releases/download/index-v8/models-index.yaml"
+    "https://github.com/interscript/interscript-models/releases/download/index-v9/models-index.yaml"
 )
 # primary env vars; the SECRYST_* names are deprecated aliases (kept one transition period)
 ENV_INDEX = "INTERSCRIPT_ML_INDEX"
diff --git a/src/interscript/ml/thai_hybrid.py b/src/interscript/ml/thai_hybrid.py
index bdd0a6d..377329b 100644
--- a/src/interscript/ml/thai_hybrid.py
+++ b/src/interscript/ml/thai_hybrid.py
@@ -3,6 +3,9 @@
 The FastThaiG2P response: dictionary hits decode at dict speed,
 out-of-vocabulary runs go to the neural model as whole spans. Maximal-
 munch longest-match segmentation; spaces/punct pass through untouched.
+
+Canonical lexicon artifact (CC BY-SA 3.0, attribution Wiktionary/Kaikki):
+https://github.com/interscript/interscript-models/releases/download/tha-lexicon-kaikki-1.0/tha-lexicon-kaikki.json
 """
 
 from __future__ import annotations