Docs: add notice about active internet connection

site/docs/installation.md

@@ -26,6 +26,13 @@ When the RatOS image has been written to the SD card, insert the SD card into th
 
 Alternatively, if you're using a pi with Ethernet, you can use an ethernet cable instead.
 
+:::danger Internet Connection is required on first run!
+There's currently a limitation in RatOS that **requires internet access** on first run. Klipper cannot compile it's c_helper functions without being connected to the internet.
+If you proceed through board flashing without the pi connected to the internet, you'll get an error saying your board is not responsive, even after it's been flashed succesfully.
+
+After succesfull flashing and detection in the configurator, an internet connection is nolonger required for operation, nor subsequent flashing.
+:::
+
 ## Preparing your control board
 
 :::info