diff --git a/README.txt b/README.txt
index 712594f..38cc181 100644
--- a/README.txt
+++ b/README.txt
@@ -1,23 +1,24 @@
-WiX cross-building support for Linux
-====================================
+WiX 3 cross-building support for Linux
+======================================
 
 This directory contains a suite of Linux shared libraries and
-supporting scripts to allow parts of the WiX toolset to run on Linux,
-generating MSI Windows installer files without depending on Windows
-itself, any official Windows DLLs, or even Wine.
+supporting scripts to allow parts of the WiX 3 toolset to run on
+Linux, generating MSI Windows installer files without depending on
+Windows itself, any official Windows DLLs, or even Wine.
 
 Requirements
 ------------
 
-This system has so far been tested only on Ubuntu 14.04.
+This system has been tested only on Ubuntu, but it has been running
+reliably for me on all stable versions of Ubuntu from 14.04 to 22.04.
 
 To run, you will need some Ubuntu packages installed:
 
  - 'mono-runtime' (to run the main CLR executables from WiX itself)
  - 'cabextract' and 'msitools' (the libraries in this suite will
    expect to be able to invoke them via fork/exec)
- - Python (currently only tested with Python 2) to run the wrapper.py
-   and makecab.py scripts that are part of this source base.
+ - Python 3 to run the wrapper.py and makecab.py scripts that are part
+   of this source base.
 
 To compile it, you will also need gcc and autotools.
 
@@ -74,15 +75,15 @@ arrange to load my .so files in place of the native-code Windows DLLs
 that those programs need; the .so files will in turn call out to
 cabextract, msibuild and my makecab.py script as necessary.
 
-Disclaimer
-----------
+Limitations
+-----------
 
-This system is very new and not very tested! I have tested it so far
-on exactly _one_ installer, namely PuTTY's one, as of the current
-master branch at https://git.tartarus.org/simon/putty.git . It is
-extremely possible that some more advanced features of WiX will not
-work in this system. I will be interested to hear about them, if so,
-but I may not have time and energy to fix them; patches would be
+This system was set up for the stable WiX 3. It's never been tested
+with WiX 4.
+
+It is extremely possible that some more advanced features of WiX will
+not work in this system. I will be interested to hear about them, if
+so, but I may not have time and energy to fix them; patches would be
 preferable to plain bug reports.
 
 Licence