diff --git a/python/lsst/ts/xml/data/sal_interfaces/ATBuilding/ATBuilding_Events.xml b/python/lsst/ts/xml/data/sal_interfaces/ATBuilding/ATBuilding_Events.xml
index 0b3d13602..94ae87960 100644
--- a/python/lsst/ts/xml/data/sal_interfaces/ATBuilding/ATBuilding_Events.xml
+++ b/python/lsst/ts/xml/data/sal_interfaces/ATBuilding/ATBuilding_Events.xml
@@ -91,4 +91,16 @@
       <Count>1</Count>
     </item>
   </SALEvent>
+  <SALEvent>
+    <Subsystem>ATBuilding</Subsystem>
+    <EFDB_Topic>ATBuilding_logevent_maximumDriveFrequency</EFDB_Topic>
+    <Description>Maximum value that is accepted by the setExtractionFanDriveFreq command. The reported frequency of the drive may exceed this if the frequency was set by manual control of the drive.</Description>
+    <item>
+      <EFDB_Name>driveFrequency</EFDB_Name>
+      <Description>Maximum drive frequency (Hz).</Description>
+      <IDL_Type>float</IDL_Type>
+      <Units>Hz</Units>
+      <Count>1</Count>
+    </item>
+  </SALEvent>
 </SALEventSet>
diff --git a/python/lsst/ts/xml/data/sal_interfaces/ATBuilding/ATBuilding_Telemetry.xml b/python/lsst/ts/xml/data/sal_interfaces/ATBuilding/ATBuilding_Telemetry.xml
index c6f9d34b1..1d2e95fd4 100644
--- a/python/lsst/ts/xml/data/sal_interfaces/ATBuilding/ATBuilding_Telemetry.xml
+++ b/python/lsst/ts/xml/data/sal_interfaces/ATBuilding/ATBuilding_Telemetry.xml
@@ -36,5 +36,12 @@
       <Units>Hz</Units>
       <Count>1</Count>
     </item>
+    <item>
+      <EFDB_Name>driveVoltage</EFDB_Name>
+      <Description>Drive line voltage (VAC).</Description>
+      <IDL_Type>float</IDL_Type>
+      <Units>V</Units>
+      <Count>1</Count>
+    </item>
   </SALTelemetry>
 </SALTelemetrySet>