diff --git a/src/cristallina/channels.py b/src/cristallina/channels.py
old mode 100644
new mode 100755
index 32844bc..fdb5282
--- a/src/cristallina/channels.py
+++ b/src/cristallina/channels.py
@@ -32,3 +32,5 @@ XEYE = "SARES30-CAMS156-XE:FPICTURE"
 # Detector Up/Down stage
 TDY = "SARES30-MOBI2:MOT_Z.RBV"
 
+# Monochromator energy
+MONO_ENERGY = "SAROP31-ODCC110:MOT_ENY.RBV"
\ No newline at end of file