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-rw-r--r--documentation/pyserial_api.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/documentation/pyserial_api.rst b/documentation/pyserial_api.rst
index b41dd0d..3887204 100644
--- a/documentation/pyserial_api.rst
+++ b/documentation/pyserial_api.rst
@@ -54,7 +54,8 @@ Native ports
Inter-character timeout, :const:`None` to disable (default).
:param bool exclusive:
- Set exclusive access mode (POSIX only).
+ Set exclusive access mode (POSIX only). A port cannot be opened in
+ exclusive access mode if it is already open in exclusive access mode.
:exception ValueError:
Will be raised when parameter are out of range, e.g. baud rate, data bits.