diff --git a/workplans/MKTF-WP-0001-epub3-read-adapter.md b/workplans/MKTF-WP-0001-epub3-read-adapter.md
index 2b75af3..1a98f6d 100644
--- a/workplans/MKTF-WP-0001-epub3-read-adapter.md
+++ b/workplans/MKTF-WP-0001-epub3-read-adapter.md
@@ -8,10 +8,11 @@ owner: markitect-filter
 topic_slug: markitect
 planning_priority: complete
 planning_order: 10
-depends_on_workplans:
+related_workplans:
   - MKTT-WP-0018
 created: "2026-05-14"
 updated: "2026-05-14"
+state_hub_workstream_id: "15595fa9-63f9-4ff5-8a9d-45f51893f085"
 ---
 
 # MKTF-WP-0001: EPUB3 Read Adapter
@@ -22,6 +23,9 @@ Implement the first concrete `markitect-filter` source adapter:
 `source.epub3`, a read-only EPUB3 adapter that satisfies the
 `markitect-tool` source adapter contract.
 
+The contract dependency is cross-repo and is tracked as related work rather
+than a same-repo State Hub dependency edge: `markitect-tool` `MKTT-WP-0018`.
+
 ## Implemented Scope
 
 - Python package scaffold with `pyproject.toml`.