diff --git a/README.adoc b/README.adoc
index 3eb62d9..bdb6896 100644
--- a/README.adoc
+++ b/README.adoc
@@ -7,4 +7,7 @@ ln -s /etc/sv/fake-hwclock/ /var/service/
 
 # Enable SPI
 echo 'dtparam=spi=on' >>/boot/config.txt
+
+# Allow big buf for SPI
+echo 'options spidev bufsiz=65536' > /etc/modprobe.d/spidev.conf
 ----