diff --git a/client/client.go b/client/client.go
index ad6105f9b..140190514 100644
--- a/client/client.go
+++ b/client/client.go
@@ -400,7 +400,7 @@ type (
 		// ListWorkflow gets workflow executions based on query. The query is basically the SQL WHERE clause, examples:
 		//  - "(WorkflowID = 'wid1' or (WorkflowType = 'type2' and WorkflowID = 'wid2'))".
 		//  - "CloseTime between '2019-08-27T15:04:05+00:00' and '2019-08-28T15:04:05+00:00'".
-		//  - to list only open workflow use "CloseTime = missing"
+		//  - to list only open workflow use "CloseTime is null"
 		// For supported operations on different server versions see [Visibility].
 		// Retrieved workflow executions are sorted by StartTime in descending order when list open workflow,
 		// and sorted by CloseTime in descending order for other queries.
diff --git a/internal/client.go b/internal/client.go
index 28777f167..f3f78212d 100644
--- a/internal/client.go
+++ b/internal/client.go
@@ -237,7 +237,7 @@ type (
 		// examples:
 		//  - "(WorkflowID = 'wid1' or (WorkflowType = 'type2' and WorkflowID = 'wid2'))".
 		//  - "CloseTime between '2019-08-27T15:04:05+00:00' and '2019-08-28T15:04:05+00:00'".
-		//  - to list only open workflow use "CloseTime = missing"
+		//  - to list only open workflow use "CloseTime is null"
 		// Retrieved workflow executions are sorted by StartTime in descending order when list open workflow,
 		// and sorted by CloseTime in descending order for other queries.
 		// For supported operations on different server versions see [Visibility].