diff --git a/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventData2.java b/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventData2.java
index c1c7320e..b2f63ba4 100644
--- a/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventData2.java
+++ b/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventData2.java
@@ -72,11 +72,11 @@ public class DeviceSecurityEventData2 extends DeviceSecurityEvent {
                     subHeaderInfo += dsedSubHeader.toString();
                 }
                 catch(NullPointerException e) {
-                    subHeaderInfo = "\n    Could not interpret Sub header info for SPDM measurment block";
+                    subHeaderInfo = "\n      Could not interpret Sub header info for SPDM measurment block";
                 }
             }
             else if (subHeaderType == DeviceSecurityEventDataSubHeader.SUBHEADERTYPE_CERT_CHAIN) {
-                subHeaderInfo += "\n    Cert chain to be implemented ";
+                subHeaderInfo += "\n      Cert chain to be implemented ";
                 try {
                     dsedSubHeader =
                             new DeviceSecurityEventDataSubHeaderCertChain(dsedSubHeaderBytes);
diff --git a/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventDataHeader2.java b/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventDataHeader2.java
index 3b0f6761..56934fef 100644
--- a/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventDataHeader2.java
+++ b/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventDataHeader2.java
@@ -39,6 +39,8 @@ public class DeviceSecurityEventDataHeader2 extends DeviceSecurityEventHeader {
     private int length = 0;
     /**
      * Event sub headerType
+     * SUBHEADERTYPE_MEAS_BLOCK = 0
+     * SUBHEADERTYPE_CERT_CHAIN = 1
      */
     @Getter
     private int subHeaderType = 0;
diff --git a/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventDataSubHeaderCertChain.java b/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventDataSubHeaderCertChain.java
index 45c9e722..eac5bc8a 100644
--- a/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventDataSubHeaderCertChain.java
+++ b/HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/DeviceSecurityEventDataSubHeaderCertChain.java
@@ -1,6 +1,7 @@
 package hirs.utils.tpm.eventlog.events;
 
 import hirs.utils.HexUtils;
+import hirs.utils.tpm.eventlog.spdm.SpdmHa;
 import hirs.utils.tpm.eventlog.spdm.SpdmMeasurementBlock;
 import lombok.Getter;
 
@@ -75,4 +76,28 @@ public class DeviceSecurityEventDataSubHeaderCertChain extends DeviceSecurityEve
 //            spdmMeasurementBlockList.add(spdmMeasurementBlock);
 //        }
     }
+
+
+    /**
+     * Returns a human-readable description of the data within this structure.
+     *
+     * @return a description of this structure.
+     */
+    public String toString() {
+        String dsedSubHeaderInfo = "";
+//        dsedSubHeaderInfo += "\n   SPDM Version: " + spdmVersion;
+//        String spdmHashAlgoStr = SpdmHa.tcgAlgIdToString(spdmMeasurementHashAlgo);
+//        dsedSubHeaderInfo += "\n   SPDM Hash Algorithm = " + spdmHashAlgoStr;
+//
+//        // SPDM Measurement Block List output
+//        dsedSubHeaderInfo += "\n   Number of SPDM Measurement Blocks = " + spdmMeasurementBlockList.size();
+//        int spdmMeasBlockCnt = 1;
+//        for (SpdmMeasurementBlock spdmMeasBlock : spdmMeasurementBlockList) {
+//            dsedSubHeaderInfo += "\n   SPDM Measurement Block # " + spdmMeasBlockCnt++ + " of " +
+//                    spdmMeasurementBlockList.size();
+//            dsedSubHeaderInfo += spdmMeasBlock.toString();
+//        }
+
+        return dsedSubHeaderInfo;
+    }
 }