spf – Does the "include:" record domain also refer to subdomains?

I have doubts whether I have set up my SPF record. I would like to know whether when setting up an inclusion record in the SPF record, the subdomains of the main domain I included are also "included".

In my doubt, let's look at an example:


v=spf1 +include:example.com -all

Does this "+ include: example.com" also cover when my emails are sent from subdomain1.example.com or subdomain2.example.com?

I am very happy about your comments.