added comment

src/playermat/Playmat.ttslua

@@ -641,6 +641,7 @@ end
 function removeTokensFromObject(object)
   for _, v in ipairs(searchArea(object.getPosition(), { 3, 1, 4 })) do
     local obj = v.hit_object
+    -- don't remove the table surface, self, any decks/cards or chaos tokens
     if obj.getGUID() ~= "4ee1f2" and
         obj ~= self and
         obj.type ~= "Deck" and