diff --git a/speech/google/cloud/speech/operation.py b/speech/google/cloud/speech/operation.py
index dda9ab449b87..62515be6f77b 100644
--- a/speech/google/cloud/speech/operation.py
+++ b/speech/google/cloud/speech/operation.py
@@ -50,7 +50,7 @@ def _update_state(self, operation_pb):
             :class:`~google.longrunning.operations_pb2.Operation`
         :param operation_pb: Protobuf to be parsed.
 
-        :raises ValueError: If there is more than one entry in ``results``.
+        :raises ValueError: If there are no ``results`` from the operation.
         """
         super(Operation, self)._update_state(operation_pb)