diff --git a/src/ExternalSensor.cpp b/src/ExternalSensor.cpp
index 745c65b..6b42a15 100644
--- a/src/ExternalSensor.cpp
+++ b/src/ExternalSensor.cpp
@@ -27,12 +27,8 @@
     std::vector<thresholds::Threshold>&& thresholdsIn,
     const std::string& sensorConfiguration, double maxReading,
     double minReading, double timeoutSecs, const PowerState& powerState) :
-    // TODO(): When the Mutable feature is integrated,
-    // make sure all ExternalSensor instances are mutable,
-    // because that is the entire point of ExternalSensor,
-    // to accept sensor values written by an external source.
     Sensor(boost::replace_all_copy(sensorName, " ", "_"),
-           std::move(thresholdsIn), sensorConfiguration, objectType, true,
+           std::move(thresholdsIn), sensorConfiguration, objectType, true, true,
            maxReading, minReading, conn, powerState),
     std::enable_shared_from_this<ExternalSensor>(), objServer(objectServer),
     writeLast(std::chrono::steady_clock::now()),