Paste your iCal feed URL from Todoist settings into the field above.
Enter a list of projects that you want to include in the feed into the text area below, one project per line.
Click Save and you will be taken directly to your new feed. Copy and paste the URL of this page into your calendar application of choice.
Please note that your iCal data is not project-hierarchy aware, so if you want to include parent/child projects then please name each one explicitly.