diff --git a/README.md b/README.md
index 4df2cf1..c85b061 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ Video about this project by [Floyd Steinberg](https://www.youtube.com/watch?v=Z3
 * In the case of Raspberry Pi 4, Update the firmware and bootloader to the latest version (not doing this may cause USB reliability issues)
 * Download from [GitHub Releases](../../releases)
 * Unzip
-* Put the files into the root directory of a FAT32 formatted partition on SD/microSD card
+* Put the files into the root directory of a FAT32 formatted partition on SD/microSD card (Note for small SD cards which are no longer sold: If less than 65525 clusters, you may need to format as FAT16.)
 * Put SD/microSD card into Raspberry Pi 1, 2, 3 or 4, or 400 (Zero and Zero 2 can be used but need HDMI or a supported i2c DAC for audio out)
 * Attach headphones to the headphone jack using `SoundDevice=pwm` in `minidexed.ini` (default) (poor audio quality)
 * Alternatively, attach a  PCM5102A or PCM5122 based DAC and select i2c sound output using `SoundDevice=i2s` in `minidexed.ini` (best audio quality)