Originally Posted by kirbykollege
It's an extract kit with specialty grains. I used half the grains an put in all the extract...
The specialty grains are mainly there for flavour, aroma, mouthfeel and don't contribute a great amount of fermentables to the wort. If you've used all your extract, and it was enough for a 5G batch, then you're fine for a 5 gallon batch. Like Freistte mentioned, steep the remaining grains, sieve or filter them out, cool and add to wort. Just make sure to properly sanitize anything you're using that makes contact with the wort.