diff --git a/modules/aeolus/geos_nav.py b/modules/aeolus/geos_nav.py
index eb25412001dcda3e12807be0e30cb203799d2cc9..32ef6f29ecf1d4eef0d833765554db8463bc06eb 100644
--- a/modules/aeolus/geos_nav.py
+++ b/modules/aeolus/geos_nav.py
@@ -32,6 +32,7 @@ r_eq = 6378.1690  # km
 # GOES ------------------------------
 h = 42164.16 # barycentric height, km
 scan_geom = 'GOES'
+# GOES-17 sub_lon = -137.0
 sub_lon = -75.0
 sub_lon *= DEG_TO_RAD