diff --git a/config/example-extras.cfg b/config/example-extras.cfg
index bf91e113..98116151 100644
--- a/config/example-extras.cfg
+++ b/config/example-extras.cfg
@@ -1527,8 +1527,10 @@
 #voltage2:
 #...
 #   A set of temperatures (in Celsius) and voltages (in Volts) to use
-#   as reference when converting a temperature. At least two
-#   measurements must be provided.
+#   as reference when converting a temperature. A heater section using
+#   this sensor may also specify an adc_voltage parameter to define
+#   the ADC comparison voltage (see example.cfg for details). At least
+#   two measurements must be provided.
 #temperature1:
 #resistance1:
 #temperature2:
@@ -1536,7 +1538,9 @@
 #...
 #   Alternatively one may specify a set of temperatures (in Celsius)
 #   and resistance (in Ohms) to use as reference when converting a
-#   temperature. At least two measurements must be provided.
+#   temperature. A heater section using this sensor may also specify a
+#   pullup_resistor parameter (see example.cfg for details). At least
+#   two measurements must be provided.
 
 
 # MAXxxxxx serial peripheral interface (SPI) temperature based