diff --git a/firmware/pump_control.cpp b/firmware/pump_control.cpp
index 4fef4e8..043f31a 100644
--- a/firmware/pump_control.cpp
+++ b/firmware/pump_control.cpp
@@ -7,6 +7,7 @@
 
 #include "ch.h"
 
+// Bosch CJ125 is somewhere VERY ROUGHLY like 200-400A/(v*s) integrator gain
 static Pid pumpPid(50.0f, 300.0f, 2);
 
 static THD_WORKING_AREA(waPumpThread, 256);