diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index e3a62a7c..9c4df766 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2008-2022 Pivotal Labs
+Copyright (c) 2008-2023 Pivotal Labs
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
@@ -8619,11 +8619,15 @@ getJasmineRequireObj().Runner = function(j$) {
        * @typedef JasmineStartedInfo
        * @property {Int} totalSpecsDefined - The total number of specs defined in this suite. Note that this property is not present when Jasmine is run in parallel mode.
        * @property {Order} order - Information about the ordering (random or not) of this execution of the suite. Note that this property is not present when Jasmine is run in parallel mode.
+       * @property {Boolean} parallel - Whether Jasmine is being run in parallel mode.
        * @since 2.0.0
        */
       await this.reporter_.jasmineStarted({
+        // In parallel mode, the jasmineStarted event is separately dispatched
+        // by jasmine-npm. This event only reaches reporters in non-parallel.
         totalSpecsDefined,
-        order: order
+        order: order,
+        parallel: false
       });
 
       this.currentlyExecutingSuites_.push(this.topSuite_);
diff --git a/spec/core/integration/EnvSpec.js b/spec/core/integration/EnvSpec.js
index a4aa0566..e96e8326 100644
--- a/spec/core/integration/EnvSpec.js
+++ b/spec/core/integration/EnvSpec.js
@@ -1888,7 +1888,8 @@ describe('Env integration', function() {
 
       expect(reporter.jasmineStarted).toHaveBeenCalledWith({
         totalSpecsDefined: 1,
-        order: jasmine.any(jasmineUnderTest.Order)
+        order: jasmine.any(jasmineUnderTest.Order),
+        parallel: false
       });
 
       expect(reporter.specDone).toHaveBeenCalledWith(
@@ -1922,7 +1923,8 @@ describe('Env integration', function() {
 
       expect(reporter.jasmineStarted).toHaveBeenCalledWith({
         totalSpecsDefined: 1,
-        order: jasmine.any(jasmineUnderTest.Order)
+        order: jasmine.any(jasmineUnderTest.Order),
+        parallel: false
       });
 
       expect(reporter.specDone).toHaveBeenCalledWith(
@@ -1970,7 +1972,8 @@ describe('Env integration', function() {
 
     expect(reporter.jasmineStarted).toHaveBeenCalledWith({
       totalSpecsDefined: 5,
-      order: jasmine.any(jasmineUnderTest.Order)
+      order: jasmine.any(jasmineUnderTest.Order),
+      parallel: false
     });
 
     expect(reporter.specDone.calls.count()).toBe(5);
@@ -2152,7 +2155,8 @@ describe('Env integration', function() {
 
     expect(reporter.jasmineStarted).toHaveBeenCalledWith({
       totalSpecsDefined: 1,
-      order: jasmine.any(jasmineUnderTest.Order)
+      order: jasmine.any(jasmineUnderTest.Order),
+      parallel: false
     });
 
     expect(reporter.specDone).toHaveBeenCalledWith(
diff --git a/src/core/Runner.js b/src/core/Runner.js
index 43b9a3a6..850fae7f 100644
--- a/src/core/Runner.js
+++ b/src/core/Runner.js
@@ -129,11 +129,15 @@ getJasmineRequireObj().Runner = function(j$) {
        * @typedef JasmineStartedInfo
        * @property {Int} totalSpecsDefined - The total number of specs defined in this suite. Note that this property is not present when Jasmine is run in parallel mode.
        * @property {Order} order - Information about the ordering (random or not) of this execution of the suite. Note that this property is not present when Jasmine is run in parallel mode.
+       * @property {Boolean} parallel - Whether Jasmine is being run in parallel mode.
        * @since 2.0.0
        */
       await this.reporter_.jasmineStarted({
+        // In parallel mode, the jasmineStarted event is separately dispatched
+        // by jasmine-npm. This event only reaches reporters in non-parallel.
         totalSpecsDefined,
-        order: order
+        order: order,
+        parallel: false
       });
 
       this.currentlyExecutingSuites_.push(this.topSuite_);