If it's outside and getting a lot of direct sun, this could be normal and ok. How brown? All aloe change color in direct sun from green to tan, brown, red, olive, purple, ..., depending upon the species and how much sun/water they get. Do you know what kind of aloe you have? You could give it a bit more water if it's getting really dry, and tell us how much sun and what kind of pot and drainage it has. Yes, a pic would be very helpful.