README.md in mpx-0.1.2 vs README.md in mpx-0.2.0

@@ -2,10 +2,10 @@
 
 ```
 A command multiplexer.
 
 The root folder MPX_ROOT is an environment variable
-which defaults to `~/.local/mpx`.
+which defaults to `$XDG_DATA_HOME/mpx`, i.e. `~/.local/share/mpx`.
 
 The following subfolders are used:
 - `bin`     Where commands are stored.
 - `spaces`  Namespaces for each command.
             Each command receives a subfolder with its name in `spaces`.