diff --git a/config/devices.properties b/config/devices.properties
index bd4239b..a45fef2 100644
--- a/config/devices.properties
+++ b/config/devices.properties
@@ -9,3 +9,4 @@ scintillatorY=ch.psi.pshell.epics.Motor X10SA-ES-MIC:TRY3 false
 scintillatorZ=ch.psi.pshell.epics.Positionable X10SA-ES-SCINTI:SET-FOCUS X10SA-ES-SCINTI:GET-FOCUS
 detectorZ=ch.psi.pshell.epics.Motor X10SA-ES-D:TRZ1 false
 detectorY=ch.psi.pshell.epics.Motor X10SA-ES-D:TRY1 false
+aperture=ch.psi.pshell.dev.MotorGroupBase apertureX apertureY