diff --git a/debye_bec/devices/mo1_bragg/mo1_bragg_enums.py b/debye_bec/devices/mo1_bragg/mo1_bragg_enums.py
index 09602b7..44b6b47 100644
--- a/debye_bec/devices/mo1_bragg/mo1_bragg_enums.py
+++ b/debye_bec/devices/mo1_bragg/mo1_bragg_enums.py
@@ -3,6 +3,13 @@
 import enum
 
 
+class Xtal(int, enum.Enum):
+    """Enum class for the xtal (crystal) of the Bragg positioner"""
+
+    Si111 = 0
+    Si311 = 1
+
+
 class TriggerControlSource(int, enum.Enum):
     """Enum class for the trigger control source of the trigger generator"""