Place roast in crockpot. I use a 5 quart slow cooker.
Sprinkle roast with salt.
In a small bowl, stir together broth, vinegar, brown sugar, and Worcestershire sauce.
Pour the broth mixture around the roast.
Cover, and cook on low for 8-10 hours.
Shred beef with two forks, and return to crockpot.
Continue cooking for an additional 30-60 minutes.
