How do you sharpen a serrated knife?

[Spec ops Grunt]

I've got a serrated Swiss Army Knife and I was wondering, how do you sharpen a serrated knife?

 

[swampgator]

I use a Lansky kit. They have a serrated edge stone which is triangular and fits in the serrations.

You could also use a round file with a diameter that matches that of the serrations.

 

[JohnKSa]

Spyderco also offers a sharpening kit that works on most serrated blades.

 

[22-rimfire]

You can also use a sharpening steel in the serrations.

 

[cedjunior]

Spyderco Sharpmaker