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-rw-r--r--pyserial/documentation/pyserial_api.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/pyserial/documentation/pyserial_api.rst b/pyserial/documentation/pyserial_api.rst
index 71b608c..d8566e3 100644
--- a/pyserial/documentation/pyserial_api.rst
+++ b/pyserial/documentation/pyserial_api.rst
@@ -670,6 +670,9 @@ Constants
.. data:: STOPBITS_ONE_POINT_FIVE
.. data:: STOPBITS_TWO
+Note that 1.5 stop bits are not supported on Posix. It will fall back to 2 stop
+bits.
+
*Byte size*
.. data:: FIVEBITS