| Index: runtime/observatory/lib/src/models/objects/notification.dart
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| diff --git a/runtime/observatory/lib/src/models/objects/notification.dart b/runtime/observatory/lib/src/models/objects/notification.dart
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| index d0d922466c465561375471c1478c55c4391b5906..1f46766ceed710aa7622e611a6e97b679a780620 100644
 | 
| --- a/runtime/observatory/lib/src/models/objects/notification.dart
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| +++ b/runtime/observatory/lib/src/models/objects/notification.dart
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| @@ -6,12 +6,13 @@ part of models;
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|  
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|  abstract class Notification {}
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|  
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| -abstract class ExceptionNotification implements Notification{
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| +abstract class ExceptionNotification implements Notification {
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|    get exception;
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| +
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|    /// [optional]
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|    StackTrace get stacktrace;
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|  }
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|  
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| -abstract class EventNotification implements Notification{
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| +abstract class EventNotification implements Notification {
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|    Event get event;
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|  }
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| 
 |