diff --git a/specification/advisor/resource-manager/Microsoft.Advisor/stable/2017-04-19/advisor.json b/specification/advisor/resource-manager/Microsoft.Advisor/stable/2017-04-19/advisor.json
index 4cf32f6e6803..7a585a28ef5b 100644
--- a/specification/advisor/resource-manager/Microsoft.Advisor/stable/2017-04-19/advisor.json
+++ b/specification/advisor/resource-manager/Microsoft.Advisor/stable/2017-04-19/advisor.json
@@ -760,6 +760,13 @@
             "format": "uuid",
             "type": "string"
           }
+        },
+        "extendedProperties": {
+          "description": "Extended properties",
+          "type": "object",
+          "additionalProperties": {
+            "type": "string"
+          }
         }
       }
     },