Update INSTALL.md

diff --git a/INSTALL.md b/INSTALL.md
index 644f7ebe739260d31474fa6c1ced25e2e6a838c1..22607aaf6f714b0d9929cb75096fb71c2a7c1b9d 100644 (file)
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -10,7 +10,7 @@ Do the usual update and upgrade:
 # apt update
 # apt upgrade
 ``` 
-**Note:** If you are following this guide for the Raspberry Pi, it is a good idea to update to the Raspian release of October 2018 or later, as a number of improvements have been made to the built-in DAC.
+**Note:** If you are following this guide but are using a full-size Rapsberry Pi with the built-in DAC, then it is a good idea to update to the Raspian release of October 2018 or later, as a number of changes have been made in the firmware that improve the built-in DAC.
 
 (Separately, if you haven't done so already, consider using the `raspi-config` tool to expand the file system to use the entire card.)