diff --git a/proto/interdomain.proto b/proto/interdomain.proto
index 735d4c1cd3ec92de41a0a0a1bc91de6acc846cd9..bcbe1b11470198bbfde5de573719c520b9fc5bb5 100644
--- a/proto/interdomain.proto
+++ b/proto/interdomain.proto
@@ -23,4 +23,5 @@ service InterdomainService {
   rpc LookUpSlice               (context.Slice             ) returns (context.SliceId             ) {}
   rpc OrderSliceFromCatalog     (context.Slice             ) returns (context.Slice               ) {}
   rpc CreateSliceAndAddToCatalog(context.Slice             ) returns (context.Slice               ) {}
+  rpc OrderSliceWithSLA(context.Slice) returns (context.SliceId) {} // If slice with SLA already exists, returns slice. If not, it creates it.
 }