Improve Observation.copy docstring
@@ -507,10 +507,12 @@ class Observation:
def copy(self, in_memory=False, **kwargs):
"""Copy observation
+ Overwriting arguments requires the 'in_memory` argument to be true.
+
Parameters
----------
in_memory : bool
- Copy observation in memory
+ Copy observation in memory.
**kwargs : dict
Keyword arguments passed to `Observation`
