diff --git a/src/scribe/models/embedding.py b/src/scribe/models/embedding.py
index e206334..2cd510c 100644
--- a/src/scribe/models/embedding.py
+++ b/src/scribe/models/embedding.py
@@ -51,7 +51,11 @@ class RuleEmbedding(Base):
     """One embedding vector per CHUNK of a rule (milestone 307, note 3026).
 
     A SIBLING of NoteEmbedding rather than a generalisation of it, decided
-    deliberately:
+    deliberately. The reasoning below turned out to be the only written
+    statement of a rule Scribe applies to every record type, so it is now also
+    NOTE 3163 — "When a record type earns its own table" — with the worked
+    cases and the cost of leaving `notes`. Read that before splitting a record
+    type off; this stays here because it is where the decision was made.
 
     - The embedding ROW could have been made polymorphic. The SEARCH could not.
       `semantic_search_notes` is a long function of Note-specific scoping —