update comment

theano/gradient.py

@@ -1517,7 +1517,8 @@ def verify_grad(fun, pt, n_tests=2, rng=None, eps=None,
         None is type-dependent)
         Raising the value of eps can raise or lower the absolute and
         relative errors of the verification depending on the
-        Op. Raising eps does not lower the verification quality. It
+        Op. Raising eps does not lower the verification quality
+        for linear operations. It
         is better to raise eps than raising abs_tol or rel_tol.
     :param out_type: dtype of output, if complex (i.e. 'complex32' or
         'complex64')