Via In Custodia Legis – this guide by Adrienne Keys, specialist in legislative information systems management within the Congressional Research Service (CRS) of the Library of Congress.

“Did you know that by using Congress.gov, you can receive notifications of committee action on legislation? Use the Legislation Advanced Search form to create a saved search and set up email alerts to stay informed. In the Legislation Advanced Search form:

1. Select the current Congress.
2. Then scroll down, or use the Actions/Status jump link found on the right side of the form, to access the Full List of legislative actions that are searchable on Congress.gov. Click the All Actions button to open the list and select one – or many – actions for which you would like to receive notifications, such as Referral to Committee, Committee Mark-up, or Reported/Committee Discharged. Note that at the top of the list, you can choose to combine multiple selections with either the OR search operator or the AND search operator, allowing you to adjust the level of specificity of your search.
3. Next, in the Committees section of the form, click either the Choose House Committees button or Choose Senate Committees button and select the committee for which you want to receive notifications. (Note that it is also possible to select multiple committees from these lists.) For a broader search, say if you want to be alerted anytime a House Committee marks up a bill, you can skip this step. Click the Search button.
4. In your search results list, click the Save this Search button found above the filters on the left side of the page. Assign your search a title and enter descriptive text if needed. Choose to Get Alerts when prompted. You will receive an alert email whenever the number of items in your saved search results changes (i.e., whenever a new item meeting your search criteria becomes available on Congress.gov). Note that you may also access your saved search from your Congress.gov account and run the search on demand at any time…”