doc: update README.md

bfabio · web-flow · commit 6e6b3f9941a8 · 2025-08-21T14:34:00.000+02:00
diff --git a/README.md b/README.md
@@ -10,6 +10,8 @@ You can install the package via composer:
 composer require bfabio/publiccode-parser-php
 ```
 
+It only supports Linux x86_64 for now.
+
 ## Usage
 
 ### Validation
