struct's field []string data can not be scan

[0x2d3c]

in redis

{
    "id": "1",
    "title": "joe",
    "nick": [
        "a",
        "b",
        "c"
    ]
}

scan result:

{
    "id": "1",
    "title": "joe",
    "nick": nil
}

this is scan data struct:

type A struct {
	ID    string   `redis:"id"`
	Title string   `redis:"title"`
	Nick  []string `redis:"nick"`
}

help please!