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 c165c067..fac00d4f 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
@@ -190,8 +190,9 @@ 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: 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).
+head: its merge check resolves that commit from the forge and builds against it, and the head stays fetchable
+after the group merges because the forge keeps every pull request's head. The catalogue's check accepts an SDK
+commit on the SDK's trunk or the head of an SDK pull request the forge holds, open or merged (ADR 0402 §2 to §4).
 
 ## Checks