diff --git a/openapi/openapiv2.json b/openapi/openapiv2.json
index 74f2dfb28..9245b58d7 100644
--- a/openapi/openapiv2.json
+++ b/openapi/openapiv2.json
@@ -18498,6 +18498,10 @@
         "declinedTargetVersionUpgrade": {
           "$ref": "#/definitions/v1DeclinedTargetVersionUpgrade",
           "description": "During a previous run of this workflow, the server may have notified the SDK\nthat the Target Worker Deployment Version changed, but the SDK declined to\nupgrade (e.g., by continuing-as-new with PINNED behavior). This field records\nthe target version that was declined.\n\nThis is a wrapper message to distinguish \"never declined\" (nil wrapper) from\n\"declined an unversioned target\" (non-nil wrapper with nil deployment_version).\n\nUsed internally by the server during continue-as-new and retry.\nShould not be read or interpreted by SDKs."
+        },
+        "timeSkippingConfig": {
+          "$ref": "#/definitions/v1TimeSkippingConfig",
+          "description": "Time-skipping configuration for this workflow execution."
         }
       },
       "title": "Always the first event in workflow history"
diff --git a/openapi/openapiv3.yaml b/openapi/openapiv3.yaml
index 93f3a1075..6f13e7c34 100644
--- a/openapi/openapiv3.yaml
+++ b/openapi/openapiv3.yaml
@@ -17307,6 +17307,10 @@ components:
 
              Used internally by the server during continue-as-new and retry.
              Should not be read or interpreted by SDKs.
+        timeSkippingConfig:
+          allOf:
+            - $ref: '#/components/schemas/TimeSkippingConfig'
+          description: Time-skipping configuration for this workflow execution.
       description: Always the first event in workflow history
     WorkflowExecutionTerminatedEventAttributes:
       type: object
diff --git a/temporal/api/history/v1/message.proto b/temporal/api/history/v1/message.proto
index cf866fcdd..bb3eb3dac 100644
--- a/temporal/api/history/v1/message.proto
+++ b/temporal/api/history/v1/message.proto
@@ -196,6 +196,9 @@ message WorkflowExecutionStartedEventAttributes {
     // Used internally by the server during continue-as-new and retry.
     // Should not be read or interpreted by SDKs.
     DeclinedTargetVersionUpgrade declined_target_version_upgrade = 40;
+
+    // Time-skipping configuration for this workflow execution.
+    temporal.api.workflow.v1.TimeSkippingConfig time_skipping_config = 41;
 }
 
 // Wrapper for a target deployment version that the SDK declined to upgrade to.