Small update to error message

theano/sandbox/cuda/__init__.py

@@ -329,7 +329,7 @@ if ((err = cudnnCreate(&_handle)) != CUDNN_STATUS_SUCCESS) {
                 if v == -1 or v[0] < 4007:
                     # 4007 is the final release of cudnn v4
                     dnn_available.avail = False
-                    dnn_available.msg = "Version too old. Update to v5, was %d." % v[0]
+                    dnn_available.msg = "Version is too old. Update to v5, was %d." % v[0]
                     raise RuntimeError(dnn_available.msg)
                 else:
                     dnn_available.avail = comp

theano/sandbox/gpuarray/dnn.py

@@ -82,7 +82,7 @@ if ((err = cudnnCreate(&_handle)) != CUDNN_STATUS_SUCCESS) {
 def _dnn_check_version():
     v = version()
     if v < 4007:
-        return False, "Version too old. Update to v5, was %d." % v
+        return False, "cuDNN version is too old. Update to v5, was %d." % v
 
     return True, None