diff --git a/script/RFscan/gun_scan1.py b/script/RFscan/gun_scan1.py
index e5ada7f..62d098c 100644
--- a/script/RFscan/gun_scan1.py
+++ b/script/RFscan/gun_scan1.py
@@ -30,7 +30,7 @@ finally:
     q.close()
     #st.close()
 
-# Here the user needs to pick a phase as reference phase onset of charge emission
+# Here the user needs to pick a phase as reference phase (onset of charge emission)
 phase_ref = 27.3
 phase_offset = - phase_ref
 caput("SINEG01-RSYS:CALC-VSUM-PHASE-OFFSET", phase_offset)