diff --git a/03-DESIGN/01-to-be/47-delivery-from-commit-to-delivered.md b/03-DESIGN/01-to-be/47-delivery-from-commit-to-delivered.md
index 31683c4f..c165c067 100644
--- a/03-DESIGN/01-to-be/47-delivery-from-commit-to-delivered.md
+++ b/03-DESIGN/01-to-be/47-delivery-from-commit-to-delivered.md
@@ -190,7 +190,8 @@ would settle it (ADR 0249 §4).
 
 **The SDK by version.** A Go module names the SDK by its released version and fetches it from the mesh's forge,
 checked against its recorded checksum; vendored copies go. Inside a group, a member may name the SDK member's
-head, and the group's composed check proves they build and compose together (ADR 0402 §2).
+head: its own merge check builds it with the SDK member read beside it, and the head stays fetchable after the
+group merges because the forge keeps every pull request's head (ADR 0402 §2, §3).
 
 ## Checks