diff --git a/Compile-firmware.md b/Compile-firmware.md
index 37c2fb5..5a8d3f5 100644
--- a/Compile-firmware.md
+++ b/Compile-firmware.md
@@ -186,6 +186,9 @@ some compiling errors to check it's better to call it without '-j 8')
 ## 6. Check the python version in libopencm3 and use python3 if not already here 
 
     sed -i 's/env python$/env python3/g' /opt/portapack-mayhem/hackrf/firmware/libopencm3/scripts/irq2nvic_h
+    
+    (from  Sep 26, 2022 Hackrf submodule, already modified that script, changing "python" -> "python3" interpreter. 
+     Be carefull, in current repo conditions, no need to send that command , otherwise you will have "python33" , that is not correct) 
 
 ## 7. Create makefile through cmake and compile (it's important to call the PATH cmd in step 3 just before making the cmake)