Old Bay Crab & Shrimp Boil

I made this for the 4th of July. I changed it a bit so here it is.
4 qts of water
12 ounce can of beer
1 cup of old bay
2 tablespoons of salt
10 small red potatoes halved
2 large yellow onions quartered
1 lg andouille sausage sliced
8 ears of corn halved
2 lbs large shrimp (20-25 ct)
12 blue claw crabs

Combine water, beer, old bay, salt to a boil, add the potatoes and onions first, cook for 8 mins, then sausage and cook for an additional 5 mins, then add the crab and corn cook for an additional 10 mins, finally add the shrimp and cook for 5 more mins. Check crabs for doneness.

Enjoy