diff --git a/sbnanaobj/StandardRecord/SRSoftwareTrigger.h b/sbnanaobj/StandardRecord/SRSoftwareTrigger.h
new file mode 100644
index 0000000..9fb67f6
--- /dev/null
+++ b/sbnanaobj/StandardRecord/SRSoftwareTrigger.h
@@ -0,0 +1,27 @@
+/**
+ * @file   /sbnanaobj/StandardRecord/SRSoftwareTrigger.h
+ * @brief  Defines CAF data structures to store sbnd::trigger::pmtSoftwareTrigger objects (header). 
+ * @author Lynn Tung
+ * @date   November 12, 2025 
+ *
+ */
+
+#ifndef SRSOFTWARETRIGGER_H
+#define SRSOFTWARETRIGGER_H
+
+#include "sbnanaobj/StandardRecord/SRConstants.h"
+
+namespace caf{
+  
+  /**
+  * @brief A struct to store software trigger information for SBND Data and MC
+  */
+  
+  struct SRSoftwareTrigger { 
+    int   npmts          = caf::kUninitializedInt;
+    float flash_peaktime = caf::kSignalingNaN; 
+    float flash_peakpe   = caf::kSignalingNaN;
+  };
+}
+
+#endif
\ No newline at end of file
diff --git a/sbnanaobj/StandardRecord/StandardRecord.h b/sbnanaobj/StandardRecord/StandardRecord.h
index ff8586b..7734946 100644
--- a/sbnanaobj/StandardRecord/StandardRecord.h
+++ b/sbnanaobj/StandardRecord/StandardRecord.h
@@ -22,6 +22,7 @@
 #include "sbnanaobj/StandardRecord/SRFakeReco.h"
 #include "sbnanaobj/StandardRecord/SROpFlash.h"
 #include "sbnanaobj/StandardRecord/SRTrigger.h"
+#include "sbnanaobj/StandardRecord/SRSoftwareTrigger.h"
 #include "sbnanaobj/StandardRecord/SRInteractionDLP.h"
 #include "sbnanaobj/StandardRecord/SRInteractionTruthDLP.h"
 
@@ -66,7 +67,7 @@ namespace caf
     bool pass_flashtrig = false;     ///< Whether this Record passed the Flash Trigger requirement
     SRSBNDFrameShiftInfo sbnd_frames; ///< List of Frame Shift in event in unit [ns] (SBND)
     SRSBNDTimingInfo sbnd_timings; ///< List of Timing Info in event in UNIX timestamp format(SBND)
-
+    SRSoftwareTrigger soft_trig; ///< Software Trigger Info in event
     int                                ndlp = 0;       ///< Number of reco DLP (ML) interactions.
     std::vector<SRInteractionDLP>      dlp;        ///< Reco DLP (ML) interactions.  
     int                                ndlp_true = 0;  ///< Number of true DLP (ML) interactions.
diff --git a/sbnanaobj/StandardRecord/classes_def.xml b/sbnanaobj/StandardRecord/classes_def.xml
index f44537f..093ef4d 100644
--- a/sbnanaobj/StandardRecord/classes_def.xml
+++ b/sbnanaobj/StandardRecord/classes_def.xml
@@ -5,8 +5,10 @@
 <!-- art::Wrappers for these products are defined in CAFMaker -->
 
 <lcgdict>
-  <class name="caf::StandardRecord" ClassVersion="15">
-   <version ClassVersion="15" checksum="1805006132"/>
+  <class name="caf::StandardRecord" ClassVersion="17">
+   <version ClassVersion="17" checksum="3621177915"/>
+   <version ClassVersion="16" checksum="3162654488"/>
+   <version ClassVersion="15" checksum="2636549707"/>
    <version ClassVersion="14" checksum="1860171062"/>
    <version ClassVersion="13" checksum="1979816256"/>
    <version ClassVersion="12" checksum="3984422068"/>
@@ -439,6 +441,8 @@
    <version ClassVersion="10" checksum="4144120809"/>
   </class>
 
+  <class name="caf::SRSoftwareTrigger" />
+
   <enum name="caf::Det_t" ClassVersion="10"/>
   <enum name="caf::Plane_t" ClassVersion="10"/>
   <enum name="caf::Wall_t" ClassVersion="10"/>