diff --git a/modules/aeolus/aeolus_amv.py b/modules/aeolus/aeolus_amv.py
index 9081d1f0caaa8c67b7561c3f6e092eb71f665542..91987c10517be8dc80bcc8c3317a9d102db9b14e 100644
--- a/modules/aeolus/aeolus_amv.py
+++ b/modules/aeolus/aeolus_amv.py
@@ -68,7 +68,7 @@ def get_amvs(amv_ds, timestamp, filepath=None):
 # raob_dict: (lat,lon) -> profiles
 # raob_time: nominal time
 # amv_ds: AMV data source
-# time_window: (minutes)
+# time_window: (minutes) to search for AMVs around raob_time
 # filepath (RAOB)
 # return dict: raob (lat, lon) -> tuple (amv_lon, amv_lat, elem, line, amv_pres, amv_spd, amv_dir)
 def match_amvs_to_raobs(raob_dict, raob_time, amv_ds, time_window=10, filepath=None):