shambali

Hi
I've just finished laying some 600 x 600 porcelain tiles and am about to start the grouting. I got a bag of Evo-Stik Technik SGS grout.

Reading the instructions, the first line says "Ensure surface is clean, dry, dust and oil free" Grand, as expected. However, further down in the same paragraph it says "Ensure joints are adequately moist before commencing"

What does that mean?????? Is it telling me to moisten the tiles before applying the grout? It does mention keeping the grout moist for a few days to prevent cracking which I can understand. But I just don't get the ensure joints are moist bit.

Any one understand this?