How to add Fedora 17 to Linux Mint grub

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http://forums.fedoraforum.org – Hello I have intalled Linux Mint and Fedora on the same hdd on differente partitions. On /dev/sda is installed Linux Mint grub2. Fedora is installed on /dev/sda6 When computer run only Linux Mint is avalible. Mint´s grub doesnot detect Fedora. In Mint I try Code: grub-update and it detect Linux Mint, Windows 8, but doestnot detect Fedora 17. But I know Fedora is there, because I can load it by SGD2. I dont want to intall grub from Fedora, I prefer to keep Mint´s grub but want to add Fedora 17 to grub, but dont know how. Any advice please? (HowTos)