diff --git a/substrate/frame/broker/src/dispatchable_impls.rs b/substrate/frame/broker/src/dispatchable_impls.rs
index ef20bc8fb8..c2e731462c 100644
--- a/substrate/frame/broker/src/dispatchable_impls.rs
+++ b/substrate/frame/broker/src/dispatchable_impls.rs
@@ -81,7 +81,8 @@ impl<T: Config> Pallet<T> {
 			last_timeslice: Self::current_timeslice(),
 		};
 		let now = frame_system::Pallet::<T>::block_number();
-		let new_sale = SaleInfoRecord {
+		// Imaginary old sale for bootstrapping the first actual sale:
+		let old_sale = SaleInfoRecord {
 			sale_start: now,
 			leadin_length: Zero::zero(),
 			price,
@@ -94,7 +95,7 @@ impl<T: Config> Pallet<T> {
 			cores_sold: 0,
 		};
 		Self::deposit_event(Event::<T>::SalesStarted { price, core_count });
-		Self::rotate_sale(new_sale, &config, &status);
+		Self::rotate_sale(old_sale, &config, &status);
 		Status::<T>::put(&status);
 		Ok(())
 	}
diff --git a/substrate/frame/broker/src/lib.rs b/substrate/frame/broker/src/lib.rs
index a39576b090..330491eb20 100644
--- a/substrate/frame/broker/src/lib.rs
+++ b/substrate/frame/broker/src/lib.rs
@@ -552,16 +552,27 @@ pub mod pallet {
 		///
 		/// - `origin`: Must be Root or pass `AdminOrigin`.
 		/// - `initial_price`: The price of Bulk Coretime in the first sale.
-		/// - `core_count`: The number of cores which can be allocated.
+		/// - `total_core_count`: This is the total number of cores the relay chain should have
+		/// after the sale concludes.
+		///
+		/// NOTE: This function does not actually request that new core count from the relay chain.
+		/// You need to make sure to call `request_core_count` afterwards to bring the relay chain
+		/// in sync.
+		///
+		/// When to call the function depends on the new core count. If it is larger than what it
+		/// was before, you can call it immediately or even before `start_sales` as non allocated
+		/// cores will just be `Idle`. If you are actually reducing the number of cores, you should
+		/// call `request_core_count`, right before the next sale, to avoid shutting down tasks too
+		/// early.
 		#[pallet::call_index(4)]
-		#[pallet::weight(T::WeightInfo::start_sales((*core_count).into()))]
+		#[pallet::weight(T::WeightInfo::start_sales((*total_core_count).into()))]
 		pub fn start_sales(
 			origin: OriginFor<T>,
 			initial_price: BalanceOf<T>,
-			core_count: CoreIndex,
+			total_core_count: CoreIndex,
 		) -> DispatchResultWithPostInfo {
 			T::AdminOrigin::ensure_origin_or_root(origin)?;
-			Self::do_start_sales(initial_price, core_count)?;
+			Self::do_start_sales(initial_price, total_core_count)?;
 			Ok(Pays::No.into())
 		}