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-rw-r--r--docs/library/utime.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/library/utime.rst b/docs/library/utime.rst
index 47d93c4c5..e678321f6 100644
--- a/docs/library/utime.rst
+++ b/docs/library/utime.rst
@@ -36,7 +36,9 @@ Functions
.. function:: sleep(seconds)
Sleep for the given number of seconds. Seconds can be a floating-point number to
- sleep for a fractional number of seconds.
+ sleep for a fractional number of seconds. Note that other MicroPython ports may
+ not accept floating-point argument, for compatibility with them use ``sleep_ms()``
+ and ``sleep_us()`` functions.
.. only:: port_wipy