diff --git a/docs/repository-rename-operations.md b/docs/repository-rename-operations.md
index 117d3ba..a997120 100644
--- a/docs/repository-rename-operations.md
+++ b/docs/repository-rename-operations.md
@@ -121,6 +121,11 @@ trust an old-slug redirect as identity. Verify the Forge numeric ID and head,
 register the new path against the existing State Hub UUID, commit canonical
 source/frontmatter updates, and run `statehub fix-consistency` in the new clone.
 
+The Forge head may advance past the preflight baseline through the source-synchronization
+revision pushed from the fresh clone. `source-synced` therefore requires the clone's
+`head_commit` to equal the current Forge head, records the baseline and `head_advanced`,
+and later phases anchor on that recorded head. Drift beyond it still fails closed.
+
 The private source evidence file must include the assertions enforced by State
 Hub. Extra non-secret references are allowed: