My private Serialize field variable gets me anerror

[glossy igloo]

In my code, I have the line: private [SerializeField] float spd;

It gave me this error: CS1031: type expected at line 11, character 13. The [ is screwing it up, but I don't know why.

How would I fix this to have a private variable that can be changed in the inspector?

Edit: Thank you @grand nymph , your advice solved my issue.

[grand nymph]

The private must come after the [SerializeField]

So [SerializeField] private float spd;

or you can get rid of the private keyword completely, it will have the same effect
[SerializeField] float spd;

[brittle glen]

I would recommend to always explicitly declare the accessibility of things.
Not at last, because implicit accessibility isn't always the same: Members declared inside types (including other types) will default to private, whereas types declared directly inside namespaces will default to internal.

[granite onyx]

float and private float are same things

can only be accessed via the script it was written in