diff --git a/neural_network/lstm.py b/neural_network/lstm.py
index 7e464ecc7..aee64fbb5 100644
--- a/neural_network/lstm.py
+++ b/neural_network/lstm.py
@@ -36,6 +36,28 @@ class LongShortTermMemory:
         >>> lstm.learning_rate
         0.01
         """
+        self.input_data: str
+        self.hidden_layer_size: int
+        self.training_epochs: int
+        self.learning_rate: float
+        self.unique_chars: set[str]
+        self.data_length: int
+        self.vocabulary_size: int
+        self.char_to_index: dict[str, int]
+        self.index_to_char: dict[int, str]
+        self.input_sequence: str
+        self.target_sequence: str
+        self.random_generator: Generator
+        self.combined_inputs: dict[int, np.ndarray]
+        self.hidden_states: dict[int, np.ndarray]
+        self.cell_states: dict[int, np.ndarray]
+        self.forget_gate_activations: dict[int, np.ndarray]
+        self.input_gate_activations: dict[int, np.ndarray]
+        self.cell_state_candidates: dict[int, np.ndarray]
+        self.output_gate_activations: dict[int, np.ndarray]
+        self.network_outputs: dict[int, np.ndarray]
+
+
         self.input_data: str = input_data.lower()
         self.hidden_layer_size: int = hidden_layer_size
         self.training_epochs: int = training_epochs