diff --git a/firmware/development/engine_sniffer.cpp b/firmware/development/engine_sniffer.cpp
index 63c431753e..55c29748c0 100644
--- a/firmware/development/engine_sniffer.cpp
+++ b/firmware/development/engine_sniffer.cpp
@@ -239,6 +239,7 @@ void initWaveChart(WaveChart *chart) {
 	printStatus();
 	addConsoleActionI("chartsize", setChartSize);
 	addConsoleActionI("chart", setChartActive);
+	// this is used by HW CI
 	addConsoleAction(CMD_RESET_ENGINE_SNIFFER, resetNow);
 #endif // EFI_UNIT_TEST
 }
diff --git a/firmware/development/engine_sniffer.h b/firmware/development/engine_sniffer.h
index e5938980e4..c7204063ec 100644
--- a/firmware/development/engine_sniffer.h
+++ b/firmware/development/engine_sniffer.h
@@ -34,6 +34,7 @@ public:
 private:
 	Logging logging;
 	char timeBuffer[_MAX_FILLER + 2];
+	// current number of events in buffer, see getSize()
 	uint32_t counter = 0;
 	/**
 	 * We want to avoid visual jitter thus we want the left edge to be aligned