diff --git a/INSTALL.md b/INSTALL.md
index 0afc3e14645aa03ecd07097d24e6712ac7717af0..428eca36542971ca256dc2076778bab1768eaf9a 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -55,6 +55,9 @@ Ensure that the line `dtparam=i2c_arm=on` is not present: that would
 activate the hardware I²C bus, which cannot be used due to a hardware
 bug in the BCM2712 SOC with regard to clock stretching.
 
+Ensure that `i2c-dev` is also present in `/etc/modules` (should be
+the case if you have used `raspi-config` to enable the I²C interface).
+
 The Python module is located in `controller/python/controller.py`.
 
 ### Firmware updater