diff --git a/README.md b/README.md
index 618c233..88fd1c5 100644
--- a/README.md
+++ b/README.md
@@ -79,7 +79,7 @@ Fun may not change the world — but it will make programming a little more fun.
 
 ...
 
-### Extensions
+### Extensions (only Linux actually)
 
 - [CGI](https://en.wikipedia.org/wiki/Common_Gateway_Interface) support builtin using [kcgi](https://kristaps.bsd.lv/kcgi/) (optional) ☐
 - [cURL](https://curl.se/) support builtin using [libcurl](https://curl.se/libcurl/) (optional) ☑