From b572aa5721e3516367c56fba9e0d09ac0edbbd2c Mon Sep 17 00:00:00 2001
From: spacemanspiff2007 <accounts@sgerber.de>
Date: Thu, 25 Jun 2020 15:35:58 +0200
Subject: [PATCH] docs/esp32: Add info about PWM duty cycle range to esp32
 quickref.

See related #4581.
---
 docs/esp32/quickref.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/esp32/quickref.rst b/docs/esp32/quickref.rst
index 8861ca4ac8..b4f443a910 100644
--- a/docs/esp32/quickref.rst
+++ b/docs/esp32/quickref.rst
@@ -175,6 +175,7 @@ range from 1Hz to 40MHz but there is a tradeoff; as the base frequency
 *increases* the duty resolution *decreases*. See 
 `LED Control <https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/peripherals/ledc.html>`_
 for more details.
+Currently the duty cycle has to be in the range of 0-1023.
 
 Use the ``machine.PWM`` class::