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-rw-r--r--digital/dev/doc/usage.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/digital/dev/doc/usage.txt b/digital/dev/doc/usage.txt
index d1dcd018..5a197600 100644
--- a/digital/dev/doc/usage.txt
+++ b/digital/dev/doc/usage.txt
@@ -62,6 +62,12 @@ Voodoo power should not be used any more:
``sudo usbprog device 0 upload blinkdemo devices``, the card is ready to
be used for programming.
+AVR with low frequency clock
+----------------------------
+
+Most AVR come with a low system clock, you might need to lower the programming
+clock using the options ``-B``: ``avrdude -p m128 -c avrispv2 -P usb -t``.
+
Firmware update mode
====================