Empty Swagger specification is created in Go API - go

Question

I am trying to use generate swagger spec from my API handler.
I have installed the go-swagger from go get:
go get -u github.com/go-swagger/go-swagger/cmd/swagger
See the project structure below:
main.go uses handler definitions in products.go. (API works and is tested)
Swagger spec in product.go:
// Package classification of Product API.
//
// Documenting for Product API
//
//
//
// Schemes: http, https
// BasePath: /
// Version: 0.0.1
//
// Consumes:
// - application/json
//
// Produces:
// - application/json
//
// swagger:meta
Running the following command from main.go path:
GO111MODULE=off swagger generate spec -o ./swagger.yaml --scan-models
Response:
info: {}
paths: {}
swagger: "2.0"
Expected Response:
basePath: /
consumes:
- application/json
info:
description: Documenting for Product API
title:
version: 0.0.1
paths: {}
producrs:
- application/json
schemes:
- http
swagger: "2.0"

Answer 1

I assume you are following Nic's MSA Go tutorial.
In case you haven't figure out the issue yet, you forgot to add a space for the contents. (lines between the first and last line)
Your documentation comment should be as below
// Documentation for Product API
//
// Schemes: http
// BasePath: /
// Version: 1.0.0
//
// Consumes:
// - application/json
//
// Produces:
// - application/json
//
// swagger:meta

Answer 2

In adition to #sssang comment. Make sure you leave no space between Documentation comment and the package definition.
// Documentation for Product API
//
// Schemes: http
// BasePath: /
// Version: 1.0.0
//
// Consumes:
// - application/json
//
// Produces:
// - application/json
//
// swagger:meta
package handlers
[...rest of your code]