- doc updates
- rename test_rawio -> test_iolib
diff --git a/documentation/pyserial_api.rst b/documentation/pyserial_api.rst
index 08f1b45..9833254 100644
--- a/documentation/pyserial_api.rst
+++ b/documentation/pyserial_api.rst
@@ -503,7 +503,8 @@
 
 Others
 -------
-Default control characters for software flow control:
+Default control characters (instnces of :class:`bytes` for Python 3.0+) for
+software flow control:
 
 .. data:: XON
 .. data:: XOFF