diff --git a/docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0001-trade-requires-two-locations.md b/docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0001-trade-requires-two-locations.md
index 892177b..9335554 100644
--- a/docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0001-trade-requires-two-locations.md
+++ b/docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0001-trade-requires-two-locations.md
@@ -7,6 +7,28 @@
 
 ---
 
+<!-- chunk:
+id: CORPUS-0001::whole::principle
+source_file: CORPUS-0001-trade-requires-two-locations.md
+repository_path: docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0001-trade-requires-two-locations.md
+domain: commerce
+layer: Layer_0--Primitive_Facts
+document_id: CORPUS-0001
+document_title: Trade Requires Two Locations
+section_heading: whole document
+chunk_role: principle
+concept_tags:
+  - local_price
+  - origin_destination
+  - movement_cost
+  - information_delay
+  - arbitrage
+knowledge_state:
+  - actor_visible
+  - inferred
+actors: []
+-->
+
 ## 0. Principle
 
 Trade begins when the same good has different value in different places.
@@ -100,3 +122,5 @@ Only then can profit be understood.
 ## 6. Success Condition
 
 If the model stops treating price as universal and starts treating price as local, this file is functioning correctly.
+
+<!-- /chunk -->