1 files changed, 5 insertions, 0 deletions

diff --git a/src/api/burn/WixToolset.Mba.Core/IDefaultBootstrapperApplication.cs b/src/api/burn/WixToolset.Mba.Core/IDefaultBootstrapperApplication.cs
index 2535f756..2fa88bdb 100644
--- a/src/api/burn/WixToolset.Mba.Core/IDefaultBootstrapperApplication.cs
+++ b/src/api/burn/WixToolset.Mba.Core/IDefaultBootstrapperApplication.cs
@@ -94,6 +94,11 @@ namespace WixToolset.Mba.Core
         event EventHandler<CachePackageCompleteEventArgs> CachePackageComplete;
 
         /// <summary>
+        /// Fired when the engine failed validating a package in the package cache that is non-vital to execution.
+        /// </summary>
+        event EventHandler<CachePackageNonVitalValidationFailureEventArgs> CachePackageNonVitalValidationFailure;
+
+        /// <summary>
         /// Fired when the engine begins the extraction of the payload from the container.
         /// </summary>
         event EventHandler<CachePayloadExtractBeginEventArgs> CachePayloadExtractBegin;