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-rw-r--r--common/Kconfig3
1 files changed, 2 insertions, 1 deletions
diff --git a/common/Kconfig b/common/Kconfig
index 83c81edac20..e1b8557e0cb 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -986,7 +986,8 @@ config ANDROID_AB_BACKUP_OFFSET
help
If non-zero, a backup bootloader message starting at this offset in
the partition will tried in the event that the primary one (starting
- at offset 0) fails its checksum.
+ at offset 0) fails its checksum. The offset is in bytes and must be
+ multiple of the block size.
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