Comstock Blueberry filling

Question

Comstock Blueberry Filling Blueberries, corn syrup, water, modified food starch and citric acid Ths Comstock website http://www.agrilinkfoods.com says this about the modified food starch 5. What type of starch is modified food starch? Does it contain gluten? It is cornstarch and it is gluten-free. All of our Comstock and Wilderness pie fillings are gluten-free. So, is it okay for Pesah??? Thank you!!!