added small comment.

theano/sandbox/cuda/var.py

@@ -113,6 +113,8 @@ class CudaNdarraySharedVariable(SharedVariable, _operators):
 
             It is also worth mentioning that, for efficient transfer to the GPU, Theano will make the new data
             ``c_contiguous``. This can require an extra copy of the data on the host.
+
+            This work what when borrow=True and when borrow=False
         """
         if not borrow:
             #TODO: check for cuda_ndarray type