# Directory github.com/ooni/probe-cli/internal This directory contains private Go packages. As a reminder, you can always check the Go documentation of a package by using ```bash go doc -all ./internal/$package ``` where `$package` is the name of the package. Some notable packages: - [netxlite](netxlite) is the underlying networking library; - [tutorial](tutorial) contains tutorials on writing new experiments, using measurements libraries, and networking code.