diff --git a/sklearn/neural_network/multilayer_perceptron.py b/sklearn/neural_network/multilayer_perceptron.py
index de559dc67e18f..248909ac97572 100644
--- a/sklearn/neural_network/multilayer_perceptron.py
+++ b/sklearn/neural_network/multilayer_perceptron.py
@@ -92,7 +92,7 @@ def _forward_pass(self, activations):
 
         Parameters
         ----------
-        activations : list, length = n_layers - 1
+        activations : list, length = n_layers
             The ith element of the list holds the values of the ith layer.
         """
         hidden_activation = ACTIVATIONS[self.activation]