diff --git a/xyz/openbmc_project/State/Boot/PostCode.interface.yaml b/xyz/openbmc_project/State/Boot/PostCode.interface.yaml
index d4825a7..2ea20b4 100644
--- a/xyz/openbmc_project/State/Boot/PostCode.interface.yaml
+++ b/xyz/openbmc_project/State/Boot/PostCode.interface.yaml
@@ -3,11 +3,12 @@
     into file system.
 
 properties:
-    - name: CurrentBootCycleIndex
+    - name: CurrentBootCycleCount
       type: uint16
       description: >
-          It is used to indicate current boot cycle index.
-          Index is start from 1 and continue to MaxBootCycleNum
+          It is used to indicate number of boot cycles that have
+          post codes archived. It starts from 1 and is limited to
+          MaxBootCycleNum.
     - name: MaxBootCycleNum
       type: uint16
       description: >
@@ -15,6 +16,21 @@
           It is used to indicate end user what's the max boot number,
           and make sure get command parameter less than it.
 methods:
+    - name: GetPostCodesWithTimeStamp
+      description: >
+          Method to get the cached post codes of the indicated boot cycle with timestamp.
+      parameters:
+        - name: Index
+          type: uint16
+          description: >
+              Index indicates which boot cycle of post codes is requested.
+              1 is for the most recent boot cycle. CurrentBootCycleCount is for the
+              oldest boot cycle.
+      returns:
+        - name: Codes
+          type: dict[uint64, uint64]
+          description: >
+            An array of post codes and timestamp in microseconds since epoch
     - name: GetPostCodes
       description: >
           Method to get the cached post codes of the indicated boot cycle.
@@ -23,11 +39,10 @@
           type: uint16
           description: >
               Index indicates which boot cycle of post codes is requested.
+              1 is for the most recent boot cycle. CurrentBootCycleCount is for the
+              oldest boot cycle.
       returns:
         - name: Codes
           type: array[uint64]
           description: >
             An array of post codes of one boot cycle.
-      errors:
-          - xyz.openbmc_project.Common.Error.InternalFailure
-          - xyz.openbmc_project.Common.Error.InvalidArgument