clarify one more docstr
@@ -86,7 +86,9 @@ class SvoFpsClass(BaseQuery):
Parameters
----------
filter_id : str
- Filter ID in the format SVO specifies it: 'facilty/instrument.filter'
+ Filter ID in the format SVO specifies it: 'facilty/instrument.filter'.
+ This is returned by `get_filter_list` and `get_filter_index` as the
+ ``filterID`` column.
Returns
-------
