diff --git a/README.md b/README.md
index 2097258..f8e4368 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,10 @@ Following inputs can be used as `step.with` keys
 | `file`        | String  |           | File to compress              |
 | `args`        | String  |           | Arguments to pass to UPX      |
 
+## :warning: Limitation
+
+This action is only available for Linux and Windows [virtual environments](https://help.github.com/en/articles/virtual-environments-for-github-actions#supported-virtual-environments-and-hardware-resources).
+
 ## 🤝 How can I help ?
 
 All kinds of contributions are welcome :raised_hands:! The most basic way to show your support is to star :star2: the project, or to raise issues :speech_balloon: You can also support this project by [**becoming a sponsor on GitHub**](https://github.com/sponsors/crazy-max) :clap: or by making a [Paypal donation](https://www.paypal.me/crazyws) to ensure this journey continues indefinitely! :rocket: