diff --git a/schemas/service.prs b/schemas/service.prs
index 6e9e26c..36df4b1 100644
--- a/schemas/service.prs
+++ b/schemas/service.prs
@@ -41,6 +41,6 @@ ServiceDependency = <depends-on @depender any @dependee ServiceState>.
 
 ; Asserts that the service is a "core" service. If *not* specified for
 ; a service X, where X is not `<milestone Y>` for some Y, the system
-; acts as if `<depends-on X <service-state <milestone core> running>>`
+; acts as if `<depends-on X <service-state <milestone core> ready>>`
 ; were asserted.
 ServiceMilestone = <core-service @serviceName any>.