diff --git a/openapi/openapiv2.json b/openapi/openapiv2.json
index 88462cb8..76161b7c 100644
--- a/openapi/openapiv2.json
+++ b/openapi/openapiv2.json
@@ -7844,6 +7844,10 @@
         "mostRecentWorkerVersionStamp": {
           "$ref": "#/definitions/v1WorkerVersionStamp",
           "title": "If set, the most recent worker version stamp that appeared in a workflow task completion"
+        },
+        "executionDuration": {
+          "type": "string",
+          "description": "Workflow execution duration is defined as difference between close time and execution time.\nThis field is only populated if the workflow is closed."
         }
       }
     },
diff --git a/openapi/openapiv3.yaml b/openapi/openapiv3.yaml
index 0943bbe6..e50059b6 100644
--- a/openapi/openapiv3.yaml
+++ b/openapi/openapiv3.yaml
@@ -5760,6 +5760,12 @@ components:
           allOf:
             - $ref: '#/components/schemas/WorkerVersionStamp'
           description: If set, the most recent worker version stamp that appeared in a workflow task completion
+        executionDuration:
+          pattern: ^-?(?:0|[1-9][0-9]{0,11})(?:\.[0-9]{1,9})?s$
+          type: string
+          description: |-
+            Workflow execution duration is defined as difference between close time and execution time.
+             This field is only populated if the workflow is closed.
     WorkflowExecutionSignaledEventAttributes:
       type: object
       properties:
diff --git a/temporal/api/workflow/v1/message.proto b/temporal/api/workflow/v1/message.proto
index 4c5e98d6..10c1bc74 100644
--- a/temporal/api/workflow/v1/message.proto
+++ b/temporal/api/workflow/v1/message.proto
@@ -58,6 +58,9 @@ message WorkflowExecutionInfo {
     int64 history_size_bytes = 15;
     // If set, the most recent worker version stamp that appeared in a workflow task completion
     temporal.api.common.v1.WorkerVersionStamp most_recent_worker_version_stamp = 16;
+    // Workflow execution duration is defined as difference between close time and execution time.
+    // This field is only populated if the workflow is closed.
+    google.protobuf.Duration execution_duration = 17;
 }
 
 message WorkflowExecutionConfig {