The standard disclaimer is something resembling this:

(your program name) comes with ABSOLUTELY NO WARRANTY; for details, see the LICENSE file. This is free software, you are welcome to redistribute it under certain conditions; for details, see the LICENSE file.

When choosing a license you should also consider two things:

• Do you mind if someone takes your code, improves it and then doesn't release the changes?
• Do you mind if someone takes your code, compiles it, and starts selling it to people without giving them the source code, or otherwise restricts the buyer from having equal rights as you gave the seller?

If either of these bugs you, I recommend using one of the GNU licenses. For more information on free software licenses, please consult this.