diff --git a/OpenAPI/TS28541_SliceNrm.yaml b/OpenAPI/TS28541_SliceNrm.yaml
index 61b5c0a0470583aadd73c83f06d86ed230bf3c72..64cb929e3198f509b681b3880094fa3538ec8af5 100644
--- a/OpenAPI/TS28541_SliceNrm.yaml
+++ b/OpenAPI/TS28541_SliceNrm.yaml
@@ -126,7 +126,9 @@ components:
         availability:
           $ref: '#/components/schemas/Support'
         periodicityList:
-          type: string
+          type: array
+          items:
+            type: integer
     DLThptPerSlice:
       type: object
       properties: