diff --git a/src/pyaro/timeseries/Filter.py b/src/pyaro/timeseries/Filter.py
index 5126bdd..6a6fbd0 100644
--- a/src/pyaro/timeseries/Filter.py
+++ b/src/pyaro/timeseries/Filter.py
@@ -825,7 +825,7 @@ def filter_data_idx(self, data: Data, stations: dict[str, Station], variables: s
 class AltitudeFilter(StationReductionFilter):
     """
     Filter which filters stations based on their altitude. Can be used to filter for a
-    minimum or maximum altitude.
+    minimum and/or maximum altitude.
     """
 
     def __init__(self, min_altitude: float | None = None, max_altitude: float | None = None):