diff --git a/src/hw/thermostat.md b/src/hw/thermostat.md
index dda035f..60d5890 100644
--- a/src/hw/thermostat.md
+++ b/src/hw/thermostat.md
@@ -3,6 +3,14 @@
 * [Wiki](https://github.com/sinara-hw/Thermostat/wiki)
 * [Firmware](https://git.m-labs.hk/M-Labs/thermostat)
 
+## Hardware Configuration
+
+For version v2.2.4 or above, you can install a 0R resistor to receive 12V Power from IDC output header(s).
+
+For version below v2.2.4, IDC output headers 12V Power are always connected.
+
+![](../img/thermostat_idc_hdrs_0R_resistors.png)
+
 ## Setup
 
 Attach Ethernet and Micro-USB cables and run:
diff --git a/src/img/thermostat_idc_hdrs_0R_resistors.png b/src/img/thermostat_idc_hdrs_0R_resistors.png
new file mode 100644
index 0000000..4509d40
Binary files /dev/null and b/src/img/thermostat_idc_hdrs_0R_resistors.png differ