diff --git a/backend/schema/schema.go b/backend/schema/schema.go
index 60a1b7796c..df4a83d342 100644
--- a/backend/schema/schema.go
+++ b/backend/schema/schema.go
@@ -47,10 +47,13 @@ func (s *Schema) Hash() [sha256.Size]byte {
 	return sha256.Sum256([]byte(s.String()))
 }
 
+// ResolveRefMonomorphised -
+// If a Ref is not found, returns ErrNotFound.
 func (s *Schema) ResolveRefMonomorphised(ref *Ref) (*Data, error) {
 	out := &Data{}
-	err := s.ResolveRefToType(ref, out)
-	if err != nil {
+
+	if err := s.ResolveRefToType(ref, out); err != nil {
+		// If a ref is not found, returns ErrNotFound
 		return nil, err
 	}
 	return out.Monomorphise(ref)