diff --git a/src/schema/rules/sidecars/mrs.yaml b/src/schema/rules/sidecars/mrs.yaml
index 9bfa4e9f22..2928752e67 100644
--- a/src/schema/rules/sidecars/mrs.yaml
+++ b/src/schema/rules/sidecars/mrs.yaml
@@ -73,6 +73,13 @@ MRSRecommendedFields:
     ReferenceSignal: recommended if MRS reference data are present
     AnatomicalImage: recommended if anatomical MRI data are present
 
+NumberOfTransientsRecommended:
+  selectors:
+    - datatype == "mrs"
+    - intersects([suffix], ["svs", "unloc"])
+  fields:
+    NumberOfTransients: recommended
+
 MRSOptionalFields:
   selectors:
     - modality == "mrs"