diff --git a/Retron-77.md b/Retron-77.md
index 07f6cf0..dd3f869 100644
--- a/Retron-77.md
+++ b/Retron-77.md
@@ -89,4 +89,12 @@ The UI is a simple menu that launches Stella as soon as a ROM image is selected.
 
 ## MCU firmware
 
-The firmware running on the two WT51F104S MCUs is proprietary and has not been published. It is unclear whether the firmware could be read or refreshed from linux.
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+The firmware running on the two WT51F104S MCUs is proprietary and has not been published. It is unclear whether the firmware could be read or refreshed from linux.
+
+# Quirks and known issues
+
+## FAT32 partition type
+
+The FAT32 partition is wrongly labelled as type 0x83 (linux ext2). As a consequence, MacOS will not mount it and instead offer to format ("initialize") the card. This can be fixed by manually changing the partition type 0x0c (FAT32) with frisk.
+
+**WARNING** Make sure that you know what you are doing. Don't accidentally mess up your other drives.
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