Update ASCII type description

README.md

@@ -44,8 +44,8 @@ Passive mode can be used in situations where the client cannot accept incoming c
 
 The transfer type determines how data is transferred. 
 
-- **ASCII type** can be used to transfer text files that use ASCII character encoding. The data may be converted before
-transfer. For example, newlines may be normalized.
+- **ASCII type** can be used to transfer ASCII files between systems with different newline representations. In this
+case, the newlines will be converted to `CRLF` style on the sending side and to native system style on the receiving side.
 - **Binary type** is used to transfer data byte by byte, without any modification. It's the recommended transfer type by
 default.