diff --git a/internal/entitlements/rule_change.go b/internal/entitlements/rule_change.go
index bb39a2b2..0694fccf 100644
--- a/internal/entitlements/rule_change.go
+++ b/internal/entitlements/rule_change.go
@@ -90,7 +90,7 @@ const (
 const (
 	MessageInactiveRule   = "That rule is no longer active."
 	MessageAlreadyApplied = "Already applied."
-	MessageInProgress     = "Another entitlement set change is in progress. Try again."
+	MessageInProgress     = "Another change collided with this one; try again."
 	MessagePopulation     = "The pools carrying this set could not be listed. Try again."
 )
 
diff --git a/internal/entitlements/rule_change_test.go b/internal/entitlements/rule_change_test.go
index b110dfbd..ce1a88a3 100644
--- a/internal/entitlements/rule_change_test.go
+++ b/internal/entitlements/rule_change_test.go
@@ -487,7 +487,7 @@ func TestRuleChangeCommitsSerializeOnRendezvous(t *testing.T) {
 		t.Fatalf("second commit error = %v, want a refusal", err)
 	}
 	if refusal.Kind != entitlements.RefusalInProgress ||
-		refusal.Message != "Another entitlement set change is in progress. Try again." {
+		refusal.Message != "Another change collided with this one; try again." {
 		t.Errorf("refusal = %q (%s), want the in-progress sentence", refusal.Message, refusal.Kind)
 	}
 
diff --git a/openspec/changes/plan-act-obligations/tasks.md b/openspec/changes/plan-act-obligations/tasks.md
index 90ed76ff..83137fa6 100644
--- a/openspec/changes/plan-act-obligations/tasks.md
+++ b/openspec/changes/plan-act-obligations/tasks.md
@@ -26,7 +26,7 @@ Each numbered section below is one commit, and its items are that commit's parts
 - [x] 2.1 End `ListOrganizationsByType` (`internal/organization/queries/organizations.sql`) with `ORDER BY name, org_id`, regenerate sqlc, and add a test with two organizations of one name that pins their order. No golden moves (the fixtures' names are distinct); the commit says so after running the suite.
 - [x] 2.2 `PollEntitlementRecompute` (`internal/workflows/entitlements/recompute_drain_workflow.go`) logs a failed `ListChangesOwingRecomputeActivity` and goes on to its sleep and continue-as-new instead of returning the error, because Temporal's five retries end after about fifteen seconds and nothing restarts a failed poller. Test with the Temporal test suite: the list activity fails on every attempt, and the poller ends with a continue-as-new error, not the activity's.
 - [x] 2.3 The `entitlement-set-history` delta corrects the drain-selection sentence to the dead-letter behaviour. Add a database test beside `TestSettleObligationOnSettledObligationWritesNothing` that a `failed` obligation is not returned by `ListPendingObligations` and is returned after `RequeueFailedObligations`.
-- [ ] 2.4 Change `MessageInProgress` (`internal/entitlements/rule_change.go:93`) to "Another change collided with this one; try again." and the literal in `internal/entitlements/rule_change_test.go:490`; the other tests compare the constant. The `entitlements` and `entitlement-set-management` deltas carry the sentence. No golden moves: the plan-act goldens' copy of the old sentence comes from the plan-act handlers, which change in tasks 4 to 8.
+- [x] 2.4 Change `MessageInProgress` (`internal/entitlements/rule_change.go:93`) to "Another change collided with this one; try again." and the literal in `internal/entitlements/rule_change_test.go:490`; the other tests compare the constant. The `entitlements` and `entitlement-set-management` deltas carry the sentence. No golden moves: the plan-act goldens' copy of the old sentence comes from the plan-act handlers, which change in tasks 4 to 8.
 
 ## 3. One rule for an outgoing default and a pool's class