diff --git a/src/ctselect/ctselect.par b/src/ctselect/ctselect.par
index 6b26a89..ce05ec4 100644
--- a/src/ctselect/ctselect.par
+++ b/src/ctselect/ctselect.par
@@ -20,6 +20,7 @@
 inobs,  f, a, "events.fits",,, "Input event list or observation definition XML file"
 outobs, f, a, "selected_events.fits",,, "Output event list or observation definition XML file"
 prefix, s, h, "selected_",,, "Prefix for event lists in observation definition XML file"
+
 #
 # Selection parameters
 #=====================
@@ -33,6 +34,7 @@ emin,    r, a, 0.1,,, "Lower energy limit (TeV)"
 emax,    r, a, 100.0,,, "Upper energy limit (TeV)"
 expr,    s, h, "",,, "Additional selection expression"
 usethres,s, h, "NONE",NONE|DEFAULT|USER,, "Energy threshold type"
+
 #
 # Standard parameters
 #====================