diff --git a/config/example.cfg b/config/example.cfg
index 74ec1224..a7d6fd3d 100644
--- a/config/example.cfg
+++ b/config/example.cfg
@@ -203,6 +203,11 @@ pid_Kd: 114
 #pid_integral_max:
 #   The maximum "windup" the integral term may accumulate. The default
 #   is to use the same value as max_power.
+#pwm_cycle_time: 0.100
+#   Time in seconds for each software PWM cycle of the heater. It is
+#   not recommended to set this unless there is an electrical
+#   requirement to switch the heater faster than 10 times a second.
+#   The default is 0.100 seconds.
 #min_extrude_temp: 170
 #   The minimum temperature (in Celsius) at which extruder move
 #   commands may be issued. The default is 170 Celsius.
diff --git a/klippy/heater.py b/klippy/heater.py
index 553b208b..83e8cf7c 100644
--- a/klippy/heater.py
+++ b/klippy/heater.py
@@ -95,7 +95,6 @@ Sensors = {
 SAMPLE_TIME = 0.001
 SAMPLE_COUNT = 8
 REPORT_TIME = 0.300
-PWM_CYCLE_TIME = 0.100
 MAX_HEAT_TIME = 5.0
 AMBIENT_TEMP = 25.
 PID_PARAM_BASE = 255.
@@ -125,7 +124,9 @@ class PrinterHeater:
             self.mcu_pwm = pins.setup_pin(printer, 'digital_out', heater_pin)
         else:
             self.mcu_pwm = pins.setup_pin(printer, 'pwm', heater_pin)
-            self.mcu_pwm.setup_cycle_time(PWM_CYCLE_TIME)
+            pwm_cycle_time = config.getfloat(
+                'pwm_cycle_time', 0.100, above=0., maxval=REPORT_TIME)
+            self.mcu_pwm.setup_cycle_time(pwm_cycle_time)
         self.mcu_pwm.setup_max_duration(MAX_HEAT_TIME)
         self.mcu_adc = pins.setup_pin(printer, 'adc', config.get('sensor_pin'))
         adc_range = [self.sensor.calc_adc(self.min_temp),