diff --git a/scikits/learn/datasets/samples_generator.py b/scikits/learn/datasets/samples_generator.py
index 2137d52c53f9d6a6e8457580b798c33599930153..3e8b2a07550baf5df1defc114bf2a15f8297ae5c 100644
--- a/scikits/learn/datasets/samples_generator.py
+++ b/scikits/learn/datasets/samples_generator.py
@@ -362,6 +362,10 @@ def swiss_roll(n_samples, noise=0.0):
     X : array of shape [n_samples, 3]
         The points.
 
+    t : array of shape [n_samples]
+        The univariate possition of the sample according to the main dimension
+        of the points in the manifold.
+
     Notes
     -----
     Original code from: