diff --git a/Development_Environment/Boards/Troubleshooting/USB_Serial_Adapter.rst b/Development_Environment/Boards/Troubleshooting/USB_Serial_Adapter.rst
index 93c3dae71a5210a3b3d0e6bac05463853f743b59..968a5dd19f5bf6f56de6a29d66d72a0a63337f79 100644
--- a/Development_Environment/Boards/Troubleshooting/USB_Serial_Adapter.rst
+++ b/Development_Environment/Boards/Troubleshooting/USB_Serial_Adapter.rst
@@ -32,7 +32,9 @@ Attaching a USB to Serial Adapter
 +-----+-------+----------+
 
 PIN 1 is the one closest to the volume button while PIN 6 is the one
-closest to the power button.
+closest to the power button. The pin functions are documented from the
+perspective of a USB to serial adapter -- the devkit receives serial input on
+pin 4 and transmits serial output on pin 5.
 
 The board can be powered in the usual way with the serial adaptor connected to
 your workstation. Depending on your operating system and any other USB devices
diff --git a/Hardware_Reference.rst b/Hardware_Reference.rst
index e37d2073dc6f60e692103fafd01ddf23d3464087..f22edbe0fdb8508ecbdeb3b9a7f17e9ae9f4e5ce 100644
--- a/Hardware_Reference.rst
+++ b/Hardware_Reference.rst
@@ -150,7 +150,7 @@ Headers
       | 6   |       |    NC    |
       +-----+-------+----------+
 
-      Note: PIN 1 is the one closest to the volume button while PIN6 is the one closest to the power button.
+      Note: PIN 1 is the one closest to the volume button while PIN6 is the one closest to the power button. The pin functions are documented from the perspective of a USB to serial adapter -- the devkit receives serial input on pin 4 and transmits serial output on pin 5.
 
 LEDs
 ~~~~