diff --git a/config/generic-fysetc-cheetah-v1.2.cfg b/config/generic-fysetc-cheetah-v1.2.cfg
index 6f2a4d66..bdba31a0 100644
--- a/config/generic-fysetc-cheetah-v1.2.cfg
+++ b/config/generic-fysetc-cheetah-v1.2.cfg
@@ -1,7 +1,7 @@
 # This file contains common pin mappings for the Fysetc Cheetah v1.2b
 # board. To use this config, the firmware should be compiled for the
-# STM32F103 with "No bootloader" and with "Use USB for communication"
-# disabled.
+# STM32F103 with "No bootloader" and serial (on USART1 PA10/PA9)
+# communication.
 
 # The "make flash" command does not work on the Cheetah. Instead,
 # after running "make", run the following command to flash the board:
diff --git a/config/printer-twotrees-sapphire-pro-2020.cfg b/config/printer-twotrees-sapphire-pro-2020.cfg
index 6de67cdb..8bf610bb 100644
--- a/config/printer-twotrees-sapphire-pro-2020.cfg
+++ b/config/printer-twotrees-sapphire-pro-2020.cfg
@@ -2,9 +2,8 @@
 # Pro printer from 2020. To use this config, the firmware should be
 # compiled for the STM32F103. When running "make menuconfig", enable
 # "extra low-level configuration setup", select the 28KiB bootloader,
-# disable "USB for communication", select USART3 for the "Serial
-# Port", and set "GPIO pins to set at micro-controller startup" to
-# "!PC6,!PD13".
+# serial (on USART3 PB11/PB10) communication, and set "GPIO pins to
+# set at micro-controller startup" to "!PC6,!PD13".
 
 # Note that the "make flash" command does not work with the Sapphire
 # Pro. After running "make", run the following command: