diff --git a/scikits/learn/cross_val.py b/scikits/learn/cross_val.py
index ba650f3..baa4fbb 100644
--- a/scikits/learn/cross_val.py
+++ b/scikits/learn/cross_val.py
@@ -174,7 +174,7 @@ class KFold(object):
     All the folds have size trunc(n/k), the last one has the complementary
     """
     assert k>0, ('cannot have k below 1')
-    assert k<n, ('cannot have k=%d greater than the number '
+    assert k<=n, ('cannot have k=%d greater than the number '
                         'of samples: %d'% (k, n))
     self.n = n
     self.k = k
@@ -253,7 +253,7 @@ class StratifiedKFold(object):
     y = np.asanyarray(y)
     n = y.shape[0]
     assert k>0, ValueError('cannot have k below 1')
-    assert k<n, ValueError('cannot have k=%d greater than the number '
+    assert k<=n, ValueError('cannot have k=%d greater than the number '
                            'of samples %d' % (k, n))
     _, y_sorted = unique(y, return_inverse=True)
     assert k <= np.min(np.bincount(y_sorted))