diff --git a/python/lsst/ts/xml/data/sal_interfaces/FiberSpectrograph/FiberSpectrograph_Commands.xml b/python/lsst/ts/xml/data/sal_interfaces/FiberSpectrograph/FiberSpectrograph_Commands.xml
index 5bdcde6ba..eabdebc64 100644
--- a/python/lsst/ts/xml/data/sal_interfaces/FiberSpectrograph/FiberSpectrograph_Commands.xml
+++ b/python/lsst/ts/xml/data/sal_interfaces/FiberSpectrograph/FiberSpectrograph_Commands.xml
@@ -35,6 +35,13 @@
       <Units>unitless</Units>
       <Count>1</Count>
     </item>
+    <item>
+      <EFDB_Name>groupID</EFDB_Name>
+      <Description>Optional group ID for the exposure; used for the FITS GROUPID header value.</Description>
+      <IDL_Type>float</IDL_Type>
+      <Units>unitless</Units>
+      <Count>1</Count>
+    </item>
   </SALCommand>
   <SALCommand>
     <Subsystem>FiberSpectrograph</Subsystem>