[mkgmap-dev] How to change a style file

Hi! Yesterday I went to a "Stammtisch", a point where some friends meet each month. The bar where we meet is tagged as a pub. That seems to be correct, I asked the owner. You can eat there mexican food and drink cocktails. When I was near the location I asked my garmin with my brandnew map to find nearby POIs with food and drink. Our location was not among them. So what have I made wrong? Without changing something it gets the "beer mug" icon from Garmin and it is a bar/nightclub. I think I have to tweak my points file a little bit, but how? Or better: Which POI should I give to a pub that it can be found in food and drink? Dani