diff --git a/03-DESIGN/01-to-be/59-the-mail-web-client.md b/03-DESIGN/01-to-be/59-the-mail-web-client.md
index 566e3b6b..cfc0638c 100644
--- a/03-DESIGN/01-to-be/59-the-mail-web-client.md
+++ b/03-DESIGN/01-to-be/59-the-mail-web-client.md
@@ -289,4 +289,4 @@ module and the page change ship together, and `mesh-mail-reader` is granted read
 operator's Approve; `mesh-mail-notifier` is unassigned only after test 13 passes live. Milestone 3 is issue 806.
 ADR 0379 §2's bar for removing Betterbird is milestone 1's; keeping Betterbird until mail reading (milestone 2) works,
 and not until the mail conversation, is the lead's proposal, for the operator to confirm with the milestones
-(playbook 04, step 5). Milestone 4 waits for threads and for the caller of issue 1419.
+(playbook 04, step 5). Milestone 4 waits for threads and for the decision that names its thread's reading-only caller (issue 1419, which needs a decision first).