diff --git a/Redfish.md b/Redfish.md
index e9a20e7..9c6d153 100644
--- a/Redfish.md
+++ b/Redfish.md
@@ -283,6 +283,7 @@
 - ReadingRangeMin
 - ReadingType
 - ReadingUnits
+- SpeedRPM
 - Status
 - Thresholds
 
diff --git a/redfish-core/include/utils/sensor_utils.hpp b/redfish-core/include/utils/sensor_utils.hpp
index 5c6b592..f3d1e56 100644
--- a/redfish-core/include/utils/sensor_utils.hpp
+++ b/redfish-core/include/utils/sensor_utils.hpp
@@ -509,7 +509,6 @@
     std::vector<
         std::tuple<const char*, const char*, nlohmann::json::json_pointer>>
         properties;
-    properties.reserve(7);
 
     properties.emplace_back("xyz.openbmc_project.Sensor.Value", "Value", unit);
 
@@ -527,6 +526,13 @@
         properties.emplace_back(
             "xyz.openbmc_project.Sensor.Threshold.Critical", "CriticalLow",
             "/Thresholds/LowerCritical/Reading"_json_pointer);
+
+        /* Add additional properties specific to sensorType */
+        if (sensorType == "fan_tach")
+        {
+            properties.emplace_back("xyz.openbmc_project.Sensor.Value", "Value",
+                                    "/SpeedRPM"_json_pointer);
+        }
     }
     else if (sensorType != "power")
     {