Added clarifying comment.

theano/sandbox/cuda/dnn.py

@@ -540,7 +540,7 @@ err%(name)s = cudnnSoftmaxForward(
            algo=algo, fail=sub['fail'], id=sub['struct_id'], name=name)
 
     def c_code_cache_version(self):
-        return (0, 1)
+        return (0, 2)
 
 
 @local_optimizer([GpuSoftmax])

theano/sandbox/cuda/tests/test_nnet.py

@@ -295,8 +295,8 @@ class test_SoftMax(unittest.TestCase):
             check_types
         )
 
-        # cuDNN cannot handle these test cases but the Theano softmax can so we
-        # test them only for the Theano softmax.
+        # cuDNN R1 cannot handle these test cases but the Theano softmax can so
+        # we test them only for the Theano softmax.
         self._cmp(2 << 15, 5, f, f_gpu)
         self._cmp(0, 10, f, f_gpu)