diff --git a/store/v2/root/builder.go b/store/v2/root/builder.go
index d1319f7020ca..885c41d24484 100644
--- a/store/v2/root/builder.go
+++ b/store/v2/root/builder.go
@@ -15,7 +15,7 @@ import (
 //  2. Configuration and loading
 //
 // The Builder interface is used to facilitate this pattern.  Namespaces (store keys) are registered
-// by calling RegisterNamespace before Build is called.  Build is then called with a Config
+// by calling RegisterKey before Build is called.  Build is then called with a Config
 // object and a RootStore is returned.  Calls to Get may return the `RootStore` if Build
 // was successful, but that's left up to the implementation.
 type Builder interface {