diff --git a/README.md b/README.md
index 9dbd618..35f142c 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
 - [x] [Continuous Integration](https://nixbld.m-labs.hk/job/stm32/stm32/thermostat)
 - [x] [Download latest firmware build](https://nixbld.m-labs.hk/job/stm32/stm32/thermostat/latest/download-by-type/file/binary-dist)
 
+NOTE: Firmware is not yet ready for production use. 
 
 ## Building