diff --git a/commands/routing/use.go b/commands/routing/use.go
index 45c783f..32ba7ac 100644
--- a/commands/routing/use.go
+++ b/commands/routing/use.go
@@ -16,18 +16,16 @@ type UseOK = commands.Unit
 // CandidateUnavailable when none can serve it. Without a policy the reference
 // is cleared and the space returns to default routing.
 //
-// The space MUST be provisioned with a provider (SpaceNotProvisioned) and the
-// policy MUST be known to the upload service, i.e. have a stored candidate set
+// The space MUST be provisioned with a provider; otherwise the invocation fails
+// with InsufficientStorage (see access.InsufficientStorageErrorName). The policy
+// MUST be known to the upload service, i.e. have a stored candidate set
 // (UnknownPolicy).
 //
 // The receipt carries no payload (Unit).
 var Use = binding.Bind[*UseArguments, *UseOK](command.MustParse("/routing/use"))
 
-const (
-	// UnknownPolicyErrorName is the stable receipt-failure name when the
-	// referenced policy has no stored candidate set.
-	UnknownPolicyErrorName = "UnknownPolicy"
-	// SpaceNotProvisionedErrorName is the stable receipt-failure name when the
-	// subject space has no service provider.
-	SpaceNotProvisionedErrorName = "SpaceNotProvisioned"
-)
+// UnknownPolicyErrorName is the stable receipt-failure name when the
+// referenced policy has no stored candidate set. A space with no service
+// provider fails with the shared InsufficientStorage name from the access
+// package, as every other capability on an unprovisioned space does.
+const UnknownPolicyErrorName = "UnknownPolicy"