undetected invalid JSON field

[AlexisAuger]

The field included in my JSON a below_note_ doesn't exist in the swagger specification 2.0

{
    "swagger": "2.0",
    "info": {
        "version": "1.0.0",
        "title": "title",
        "description": "descritpion",
        "note": "mynote",
        "contact": {
            "name": "myname",
            "email": "blabla@foo.com"
        }
    }
}

when i run:

swagger-flex -s doc/*.json

It returns : Validation passed

When i test the code here i get an error in this editor
http://editor.swagger.io/#/

the error is:

Errors
Schema error at info
additionalProperty "note" exists in when not allowed