diff --git a/host_applications/linux/apps/gencmd/vcgencmd.1 b/host_applications/linux/apps/gencmd/vcgencmd.1
index ec424b080..4195eaf12 100644
--- a/host_applications/linux/apps/gencmd/vcgencmd.1
+++ b/host_applications/linux/apps/gencmd/vcgencmd.1
@@ -112,8 +112,11 @@ for any reason.
 .
 .TP
 .B measure_temp
-Returns the temperature of the SoC as measured by the on-board temperature
-sensor.
+Returns the temperature of the SoC as measured by its internal temperature
+sensor;
+on Raspberry Pi 4,
+.B "measure_temp pmic"
+returns the temperature of the PMIC.
 .
 .TP
 .BI measure_clock \ clock