diff --git a/rpc/swagger/swagger.yaml b/rpc/swagger/swagger.yaml
index 7f738f1e2..a87a37786 100644
--- a/rpc/swagger/swagger.yaml
+++ b/rpc/swagger/swagger.yaml
@@ -1261,6 +1261,9 @@ definitions:
         $ref: "#/definitions/BlockId"
       header:
         $ref: "#/definitions/BlockHeader"
+      number_txs:
+        type: string
+        example: "54"
   Blockchain:
     type: object
     required: