diff --git a/boards/ststm32/bluepill_f103c8.rst b/boards/ststm32/bluepill_f103c8.rst
index 9d356775a7..4e54df829e 100644
--- a/boards/ststm32/bluepill_f103c8.rst
+++ b/boards/ststm32/bluepill_f103c8.rst
@@ -73,6 +73,7 @@ BluePill F103C8 supports the following uploading protocols:
 * ``dfu``
 * ``jlink``
 * ``mbed``
+* ``serial``
 * ``stlink``
 
 Default protocol is ``stlink``