diff --git a/src/qibotn/circuit_convertor.py b/src/qibotn/circuit_convertor.py
index 441273e..03e96fa 100644
--- a/src/qibotn/circuit_convertor.py
+++ b/src/qibotn/circuit_convertor.py
@@ -29,9 +29,6 @@ class QiboCircuitToEinsum:
         """Create the operands for dense vector computation in the interleave
         format.
 
-        Parameters:
-            None
-
         Returns:
             Operands for the contraction in the interleave format.
         """
@@ -106,9 +103,6 @@ class QiboCircuitToEinsum:
 
         Parameters:
             circuit (object): The quantum circuit object.
-
-        Returns:
-            None
         """
         self.gate_tensors = []
         gates_qubits = []
@@ -139,9 +133,6 @@ class QiboCircuitToEinsum:
         Parameters:
             backend (object): The backend object providing the array conversion method.
             dtype (object): The data type for the quantum state vectors.
-
-        Returns:
-            None
         """
         asarray = backend.asarray
         state_0 = asarray([1, 0], dtype=dtype)
@@ -157,9 +148,6 @@ class QiboCircuitToEinsum:
 
         Parameters:
             circuit (object): The quantum circuit object.
-
-        Returns:
-            None
         """
         self.gate_tensors_inverse = []
         gates_qubits_inverse = []
diff --git a/src/qibotn/circuit_to_mps.py b/src/qibotn/circuit_to_mps.py
index 48ebde7..9d98c19 100644
--- a/src/qibotn/circuit_to_mps.py
+++ b/src/qibotn/circuit_to_mps.py
@@ -14,9 +14,6 @@ class QiboCircuitToMPS:
         gate_algo(dict): Dictionary for SVD and QR settings.
         datatype (str): Either single ("complex64") or double (complex128) precision.
         rand_seed(int): Seed for random number generator.
-
-    Return:
-        None.
     """
 
     def __init__(
diff --git a/src/qibotn/mps_contraction_helper.py b/src/qibotn/mps_contraction_helper.py
index e562850..c437004 100644
--- a/src/qibotn/mps_contraction_helper.py
+++ b/src/qibotn/mps_contraction_helper.py
@@ -19,9 +19,6 @@ class MPSContractionHelper:
 
     Parameters:
         num_qubits: The number of qubits for the MPS.
-
-    Return:
-        None.
     """
 
     def __init__(self, num_qubits):