diff --git a/rpi-eeprom-update b/rpi-eeprom-update
index 7a9b649..fc9cfd5 100755
--- a/rpi-eeprom-update
+++ b/rpi-eeprom-update
@@ -351,10 +351,16 @@ in /etc/default/rpi-eeprom-update by defining the BOOTFS variable.
 A backup of the current EEPROM config file is written to ${FIRMWARE_BACKUP_DIR}
 before applying the update.
 
+Unless the -d flag is specified, the current bootloader configuration is
+retained.
+
 Options:
    -a Automatically install bootloader and USB (VLI) EEPROM updates.
    -A Specify which type of EEPROM to automatically update (vl805 or bootloader)
-   -d Use the default bootloader config instead of migrating the current settings
+   -d Use the default bootloader config, or if a file is specified using the -f
+      flag use the config in that file. This option only applies when a
+      bootloader EEPROM update is needed; if the bootloader EEPROM is up-to-date
+      then its config will not be changed.
    -f Install the given file instead of the latest applicable update
       Ignores the FREEZE_VERSION flag in bootloader and is intended for manual
       firmware updates.