diff --git a/script/users/X-Treme users/Na_K_edge_XAS.py b/script/users/X-Treme users/Na_K_edge_XAS.py
index 4aa630ae..633758d6 100644
--- a/script/users/X-Treme users/Na_K_edge_XAS.py	
+++ b/script/users/X-Treme users/Na_K_edge_XAS.py	
@@ -1,4 +1,5 @@
 """
+# for Mg K edge XAS
 Estart = 1290.0
 Estop  = 1340.0
 OTFtime = 10.0
@@ -6,7 +7,7 @@ OTFtime = 10.0
 # grating has to be grating 2
 # Exit slit 100.0
 
-
+# for Na K edge XAS
 Estart = 1065.0
 Estop  = 1095.0
 OTFtime = 10.0