add description to balances
@@ -30,6 +30,11 @@ type BalanceOf<T> = <<T as Trait>::PolkaBTC as Currency<<T as system::Trait>::Ac
const _MODULE_ID: ModuleId = ModuleId(*b"ily/trsy");
/// The pallet's configuration trait.
+/// Instantiation of this pallet requires the existence of a module that
+/// implements Currency and ReservableCurrency. The Balances module can be used
+/// for this. The Balances module then gives functions for total supply, balances
+/// of accounts, and any function defined by the Currency and ReservableCurrency
+/// traits.
pub trait Trait: system::Trait {
/// The PolkaBTC currency
type PolkaBTC: Currency<Self::AccountId> + ReservableCurrency<Self::AccountId>;
