update the doc string
@@ -1097,7 +1097,8 @@ class Operator(object):
sectors, (block spin order) according to the number of particles in the system.
Args:
- m (int): number of fermionic particles
+ m (list, int): number of particles, if it is a list, the first number is alpha
+ and the second number if beta.
threshold (float): threshold for Pauli simplification
Returns:
