diff --git a/content/experiment-control/control-loops.md b/content/experiment-control/control-loops.md
index ec5878cd..f606cfd6 100644
--- a/content/experiment-control/control-loops.md
+++ b/content/experiment-control/control-loops.md
@@ -88,6 +88,7 @@ Specifications:
 - Programming interface: Ethernet accessible via RJ45 connector on the front panel
 - Power supply: +12V DC (1.5A max) supplied either by a front-panel barrel connector, via 100mils Zotino connector, or PoE (up to 30W).
 - STM32 MCU
+- <a href="https://git.m-labs.hk/M-Labs/thermostat" target="_blank" rel="noopener noreferrer">Firmware</a>
 
 {% end %}