diff --git a/firmware/controllers/can/can.h b/firmware/controllers/can/can.h
index 69819b3299..4c2d6e0c94 100644
--- a/firmware/controllers/can/can.h
+++ b/firmware/controllers/can/can.h
@@ -53,7 +53,7 @@ void processCanRxMessage(const size_t busIndex, const CANRxFrame& msg, efitick_t
 void registerCanListener(CanListener& listener);
 void registerCanSensor(CanSensorBase& sensor);
 
-class CanWrite final : public PeriodicController<512> {
+class CanWrite final : public PeriodicController</*TStackSize*/512> {
 public:
 	CanWrite();
 	void PeriodicTask(efitick_t nowNt) override;
diff --git a/firmware/controllers/can/can_tx.cpp b/firmware/controllers/can/can_tx.cpp
index f833fb8dbc..24ed1a3e39 100644
--- a/firmware/controllers/can/can_tx.cpp
+++ b/firmware/controllers/can/can_tx.cpp
@@ -30,6 +30,7 @@ PUBLIC_API_WEAK bool boardEnableSendWidebandInfo() { return true; }
 
 static uint16_t m_cycleCount = 0;
 
+// this is invoked at CAN_CYCLE_FREQ frequency
 void CanWrite::PeriodicTask(efitick_t nowNt) {
 	UNUSED(nowNt);
 	CanCycle cycle(m_cycleCount);