diff --git a/documentation/pyserial_api.rst b/documentation/pyserial_api.rst
index f7216e4..357852e 100644
--- a/documentation/pyserial_api.rst
+++ b/documentation/pyserial_api.rst
@@ -694,12 +694,14 @@
 
 Usage::
 
+    import serial
+    import serial.rs485
     ser = serial.Serial(...)
     ser.rs485_mode = serial.rs485.RS485Settings(...)
     ser.write(b'hello')
 
 There is a subclass :class:`rs485.RS485` available to emulate the RS485 support
-on regular serial ports.
+on regular serial ports (``serial.rs485`` needs to be imported).
 
 
 .. class:: rs485.RS485Settings
diff --git a/serial/serialposix.py b/serial/serialposix.py
index 23e19c4..78959ce 100644
--- a/serial/serialposix.py
+++ b/serial/serialposix.py
@@ -52,7 +52,7 @@
 
 
 # some systems support an extra flag to enable the two in POSIX unsupported
-# partiy settings for MARK and SPACE
+# paritiy settings for MARK and SPACE
 CMSPAR = 0  # default, for unsupported platforms, override below
 
 # try to detect the OS so that a device can be selected...