diff --git a/monitor/tach_sensor.cpp b/monitor/tach_sensor.cpp
index 5e985d0..6789ed8 100644
--- a/monitor/tach_sensor.cpp
+++ b/monitor/tach_sensor.cpp
@@ -108,6 +108,8 @@
         }
         catch (std::exception& e)
         {
+            log<level::INFO>("Not monitoring a tach sensor",
+                    entry("SENSOR=%s", _name.c_str()));
             throw InvalidSensorError();
         }