diff --git a/google/cloud/dialogflow/cx/v3/test_case.proto b/google/cloud/dialogflow/cx/v3/test_case.proto
index f7b942221b..94e69aaed0 100644
--- a/google/cloud/dialogflow/cx/v3/test_case.proto
+++ b/google/cloud/dialogflow/cx/v3/test_case.proto
@@ -266,6 +266,9 @@ message ConversationTurn {
     // utterance. Often if parameters are injected, webhooks should not be
     // enabled.
     bool is_webhook_enabled = 3;
+
+    // Whether sentiment analysis is enabled.
+    bool enable_sentiment_analysis = 7;
   }
 
   // The output from the virtual agent.