How to add multiple example values for an array in OpenAPI/Swagger?

Question

I am using Swagger OpenAPI Specification tool. I have a string array property in one of the definitions as follows:

cities:
    type: array
    items:
      type: string
      example: "Pune"

My API produces JSON result, so Swagger UI displays the following example for the response:

{
  "cities": [
    "Pune"
  ]
}

How can I add multiple example values for the cities array? Expecting the result as:

{
  "cities": [
    "Pune",
    "Mumbai",
    "Bangaluru"
  ]
}

Tried comma-separated strings in the example key like below:

cities:
    type: array
    items:
      type: string
      example: "Pune", "Mumbai", "Bangaluru"

But the Swagger Editor shows an error, "Bad indentation".

Is there any way to specify multiple values in the example key?

Update

User Helen below has given the correct answer. I had an indentation problem hence there were nested arrays (2d arrays)

Correct way:

cities:
    type: array
    items:
      type: string
    example: 
    - Pune
    - Mumbai

My way (which was wrong)

cities:
    type: array
    items:
      type: string
      example: 
      - Pune
      - Mumbai

Look for the indentation of the example key in the above two cases which makes the difference, its YAML indentation matters.

Answer 1

To display an array example with multiple items, add the example on the array level instead of item level:

cities:
  type: array
  items:
    type: string
  example:
    - Pune
    - Mumbai
    - Bangaluru

  # or
  # example: [Pune, Mumbai, Bangaluru]

In case of array of objects, the example would look like this:

type: array
items:
  type: object
  properties:
    id:
      type: integer
    name:
      type: string
example:
  - id: 1
    name: Prashant
  - id: 2
    name: Helen