fix Qt instructions

README.md

@@ -41,7 +41,7 @@ Chromium-based browser such as<br>Chrome, Brave | <details><summary>✔</summary
 Electron-based application such as<br>VSCode, Slack, Spotify, Discord and [many more](https://www.electronjs.org/apps) | <details><summary>✔</summary>For each of those applications, you need to set the same adjustments like for Chrome (please click cell above). Some may offer a convenience settings flag too.</details> | ❌
 Java application | <details><summary>✔</summary>You need to install the ATK bridge: For Debian/Ubuntu-based systems, this is `apt install libatk-wrapper-java`. For Arch Linux based ones, it's `java-atk-wrapper-openjdk8` (depending on the Java version).</details> | ❌
 Gtk application | ✔ | ❌
-Qt5+ application | ✔ | ❌
+Qt5+ application | <details><summary>✔</summary>Most programs work fine out of the box, but for some (e.g. VirtualBox Gui), you also need to set the environment variable `QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1`. You can achieve this e.g. by putting this into `/etc/environment` and rebooting. | ❌
 Old Qt4 application | <details><summary>✔</summary>In the rare case the window is an exotic, old application built with Qt4, such as some programs that haven't been maintained since 2015, you need to install `qt-at-spi`.</details> | ❌
 Other things such as<br>games, Tk Guis, Wine, Steam,<br>anything exotic that doesn't support AtSpi | <details><summary>❌</summary>No chance to get them to work. For some others, according to the internet, these following environment variables may also help: `GNOME_ACCESSIBILITY=1`, `QT_ACCESSIBILITY=1`, `GTK_MODULES=gail:atk-bridge` and `QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1`. This is probably only relevant for outdated programs too, if ever.<br><br>If you're unsure about the state of some program, please open an issue so we can investigate.</details> | ❌