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diff --git a/docs/flashing.md b/docs/flashing.md index 95b3680410..4867c20bec 100644 --- a/docs/flashing.md +++ b/docs/flashing.md @@ -236,7 +236,7 @@ Flashing sequence: ## STM32/APM32 DFU -All STM32 and APM32 MCUs, except for F103 (see the [STM32duino section](#stm32duino)) come preloaded with a factory bootloader that cannot be modified nor deleted. +All USB-capable STM32 and APM32 MCUs, except for a small handful (such as STM32F103 -- see the [STM32duino section](#stm32duino)) come preloaded with a factory bootloader that cannot be modified nor deleted. To ensure compatibility with the STM32-DFU bootloader, make sure this block is present in your `rules.mk` (optionally with `apm32-dfu` instead): |