diff --git a/firmware/integration/rusefi_config.txt b/firmware/integration/rusefi_config.txt
index 62c4dd8009..a72afcb907 100644
--- a/firmware/integration/rusefi_config.txt
+++ b/firmware/integration/rusefi_config.txt
@@ -116,6 +116,7 @@ struct_no_prefix engine_configuration_s
 #define TCU_SOLENOID_COUNT 6
 #define TCU_GEAR_COUNT 10
 
+! Matt says: The problem is the driver chip. Tle9201 can't do 20k. The drivers are too slow. On purpose to reduce EMI
 #define ETB_HW_MAX_FREQUENCY 10000
 #define ETB_COUNT 2
 #define DC_PER_STEPPER 2