diff --git a/esbo-etc_defaults.xml b/esbo-etc_defaults.xml
index dd61873..1192af2 100644
--- a/esbo-etc_defaults.xml
+++ b/esbo-etc_defaults.xml
@@ -4,7 +4,7 @@
         <wl_max val="5" val_unit="um" comment="Shortest wavelength used for binning input spectra"/>
         <wl_delta val="1" val_unit="nm" comment="Wavelength increment used for binning input spectra"/>
         <d_aperture val="0.5" val_unit="m" comment="Diameter of the telescope aperture"/>
-        <psf val="Airy" osf="10" osf_unit="" comment="PSF of the optical system. Can be Airy or a file"/>
+        <psf type="Airy" osf="10" osf_unit="" comment="PSF of the optical system. Can be Airy or a file"/>
         <jitter_sigma val="10" val_unit="arcsec" comment="Sigma of the telescope jitter"/>
         <output path="results" format="fits" comment="Output directory to store output files"/>
         <exposure_time val="0.1, 1.2" val_unit="s" comment="The exposure time"/>