diff --git a/source/linux/Foundational_Components/Tools/Flash_via_Fastboot.rst b/source/linux/Foundational_Components/Tools/Flash_via_Fastboot.rst
index 6142b165..59582c7f 100644
--- a/source/linux/Foundational_Components/Tools/Flash_via_Fastboot.rst
+++ b/source/linux/Foundational_Components/Tools/Flash_via_Fastboot.rst
@@ -98,6 +98,13 @@ images after make can be found in :file:`board-support/built-images`.
 
 For more details regarding USB DFU refer :ref:`usb-device-firmware-upgrade-label`.
 
+.. note::
+
+   CONFIG_FASTBOOT_BUF_SIZE is defined in am6x_a53_snagfactory.config and specifies
+   the maximum buffer size for flashing files. Its value must be equal or greater
+   than the largest file size being flashed. If smaller, non-sparse images will
+   not flash correctly due to issues with chunked processing.
+
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 Connections
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