diff --git a/schemas/commodity-v3.0.json b/schemas/commodity-v3.0.json
index f3c08fa..9b8971d 100644
--- a/schemas/commodity-v3.0.json
+++ b/schemas/commodity-v3.0.json
@@ -41,6 +41,9 @@
                 "stationName": {
                     "type"      : "string",
                     "minLength" : 1
+                },                
+                "marketId": {
+                    "type"          : "number"
                 },
                 "timestamp": {
                     "type"      : "string",