diff --git a/tutorials/clinical/60_sleep.py b/tutorials/clinical/60_sleep.py
index a878b7747e7..eefeda02070 100644
--- a/tutorials/clinical/60_sleep.py
+++ b/tutorials/clinical/60_sleep.py
@@ -249,7 +249,7 @@ def eeg_power_band(epochs):
 
     Returns
     -------
-    X : numpy array of shape [n_samples, 5]
+    X : numpy array of shape [n_samples, 5 * n_channels]
         Transformed data.
     """
     # specific frequency bands