How to activate tristate in Buildroot

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I need to activate tristate support in Buildroot to further expand the functionality, but I'm new and I can't figure out how to activate this feature, as well as why even if I write my simple KConfig with only 1 tristate option, when running kconfig-mconfig I can still only select y/n

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Егор On BEST ANSWER

It turns out I just needed to add

config BR2_MODULES
    bool "Modules support"
    option modules

to a file Config.in after that, tristate is safely displayed in make menuconfig