diff --git a/ilt1000.py b/ilt1000.py
index 2556aa2..4998795 100755
--- a/ilt1000.py
+++ b/ilt1000.py
@@ -38,7 +38,6 @@ class Saturated(Error):
 # startlogdata
 # stoplogdata
 # usecalfactor
-# usefeedbackres
 # erasecalfactor
 # getcalfactor
 # setcalfactor
@@ -57,6 +56,11 @@ class ILT1000(object):
     2: 'User',
   }
 
+  FEEDBACK_RES_AUTO = 0
+  FEEDBACK_RES_LOW = 1
+  FEEDBACK_RES_MEDIUM = 2
+  FEEDBACK_RES_HIGH = 3
+
   # ILT1000 presents two FTDI serial devices, which become ttyUSB0 and ttyUSB1
   # if nothing else is attached. ttyUSB0 seems to be completely non-responsive.
   # We default to ttyUSB1
@@ -204,3 +208,6 @@ class ILT1000(object):
   def GetFeedbackResistanceOhm(self):
     ret = self._SendCommand('getfeedbackres')
     return float(ret) * 100
+
+  def SetFeedbackResistor(self, resistor):
+    assert int(self._SendCommand('usefeedbackres %d' % resistor)) == 0