diff --git a/Full-details-for-Compilation-and-Installation-in-Raspbian-Or-OSMC.md b/Full-details-for-Compilation-and-Installation-in-Raspbian-Or-OSMC.md
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--- a/Full-details-for-Compilation-and-Installation-in-Raspbian-Or-OSMC.md
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@@ -1,3 +1,5 @@
+**NOTE: Support for MMAL and OMX was deprecated in Raspi OS Bullseye and the required libraries consequently removed from the OS. These instructions should still work for a wide variety of platforms, including any version of Pi running RaspiOS Buster or generic x86 hardware running Debian.**
+
 A lot of people are having problems in compiling and installing moonlight-embedded from source. Based on [the instructions from this post](https://github.com/irtimmer/moonlight-embedded/issues/716#issuecomment-445205242):
 
 1) Supposingly you do have latest Raspbian image already installed (Raspbian can be found here: https://www.raspberrypi.org/downloads/raspbian/) - first of all - make sure you uninstall previous moonlight-embedded version (if installed):