diff --git a/sbnobj/Common/Reco/CorrectedOpFlashTiming.h b/sbnobj/Common/Reco/CorrectedOpFlashTiming.h
index 2c05086e..7e3ba706 100644
--- a/sbnobj/Common/Reco/CorrectedOpFlashTiming.h
+++ b/sbnobj/Common/Reco/CorrectedOpFlashTiming.h
@@ -27,6 +27,8 @@ namespace sbn {
   float        NuToFLight             { fDefault };      ///< | Nu ToF using light only | (us)
   float        NuToFCharge             { fDefault };       ///< | Nu ToF Z from tpc vertex | (us)
   float        OpFlashT0Corrected    { fDefault };       ///< | OpFlash Time wrt RWM time after light propagation corrections | (us)
+  float        ParticlePropagationTime { fDefault }; ///< | Average particle propagation time used to correct flash t0 | (us)
+  float        PhotonPropagationTime { fDefault }; ///< | Average photon propagation time used to correct flash t0 | (us)
   /// @}
   
   };
diff --git a/sbnobj/Common/Reco/classes_def.xml b/sbnobj/Common/Reco/classes_def.xml
index 9495f8ed..b7ba67a6 100644
--- a/sbnobj/Common/Reco/classes_def.xml
+++ b/sbnobj/Common/Reco/classes_def.xml
@@ -315,7 +315,9 @@
 
   <class name="std::vector<geo::PlaneID>"/>
 
-  <class name="sbn::CorrectedOpFlashTiming" ClassVersion="16">
+  <class name="sbn::CorrectedOpFlashTiming" ClassVersion="18">
+   <version ClassVersion="18" checksum="1139303800"/>
+   <version ClassVersion="17" checksum="1139303800"/>
    <version ClassVersion="16" checksum="1734226620"/>
    <version ClassVersion="15" checksum="2401924061"/>
    <version ClassVersion="14" checksum="2635318722"/>