Clojurians Log v2

Hello guys. Found in the Duct sources docstring for method duct.core/fold-modules saying:

Fold a system map of modules into an Integrant configuration. A module is a
pure function that transforms a configuration map. The modules are traversed
in dependency order and applied to iteratively to a blank map in order to
build the final configuration.

So duct modules could have it’s own dependencies and will be initialized in strict order. My question how exactly I can define inter module dependencies?