Documentation .rst files, first line

I’m trying to somewhat familiarize myself with the .rst source for the documentation. Some files have a first line starting with .. — e.g.:

.. _default_gateway:

What is the purpose of this line? Is it some internal referance?

It looks like this is comments.
I recommend looking at the answers here:

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These are section labels for cross-referencing: Roles — Sphinx documentation


Thanks, that cleared up my confusion regarding cross-references as well :slight_smile: