Suspended chords have no thrid, a suspended chord can have no third, instead it has a 4 or 2 in it's place, like so...
Sus2 = 1-2-5
Sus4 = 1-4-5
Make enough sense, but it get complicated, when you have sus7 chord, the 7th is flatted due to it's dominant nature, which I neglected to mention in the minor chord lesson. Here are few suspended chords that show this.
7Sus4 = 1-4-5-b7
9Sus4 = 1-4-5-b7-9
11Sus4 = 1-4-5-b7-9-11
13Sus4 = 1-4-5-b7-9-11-13
Now I'm pretty sure you've gotten the idea already, just remeber a sus can NEVER have a 3rd, if it does, it's another type of chord. Here's a 7Sus4 chord for you to have suspended taste.