diff --git a/for_rusefi/readme.txt b/for_rusefi/readme.txt
index 2e939cf..fb75d66 100644
--- a/for_rusefi/readme.txt
+++ b/for_rusefi/readme.txt
@@ -1 +1,3 @@
-The file wideband_image.h is generated for use by rusEFI to be able to beam firmware updates to attached wideband contollers.
\ No newline at end of file
+The file wideband_image.h is generated for use by rusEFI to be able to beam firmware updates to attached wideband controllers.
+
+Use ``cd firmware/boards/f0_module ; ./build_wideband.sh`` to build a fresh version.
\ No newline at end of file