diff --git a/ticdc/ticdc-canal-json.md b/ticdc/ticdc-canal-json.md
index 58221cd1a744b..a687887167c75 100644
--- a/ticdc/ticdc-canal-json.md
+++ b/ticdc/ticdc-canal-json.md
@@ -64,7 +64,7 @@ TiCDC encodes a DDL Event into the following Canal-JSON format.
     "data": null,
     "old": null,
     "_tidb": {     // TiDB extension field
-        "commitTs": 163963309467037594
+        "commitTs": 429918007904436226  // A TiDB TSO timestamp
     }
 }
 ```
@@ -133,7 +133,7 @@ TiCDC encodes a row of DML data change event as follows:
     ],
     "old": null,
     "_tidb": {     // TiDB extension field
-        "commitTs": 163963314122145239
+        "commitTs": 429918007904436226  // A TiDB TSO timestamp
     }
 }
 ```
@@ -162,7 +162,7 @@ The following is an example of the WATERMARK Event.
     "data": null,
     "old": null,
     "_tidb": {     // TiDB extension field
-        "watermarkTs": 429918007904436226
+        "watermarkTs": 429918007904436226  // A TiDB TSO timestamp
     }
 }
 ```
diff --git a/ticdc/ticdc-sink-to-kafka.md b/ticdc/ticdc-sink-to-kafka.md
index 42bda65dd11a7..4eb8986be1232 100644
--- a/ticdc/ticdc-sink-to-kafka.md
+++ b/ticdc/ticdc-sink-to-kafka.md
@@ -355,7 +355,7 @@ The message format with handle keys only is as follows:
     ],
     "old": null,
     "_tidb": {     // TiDB extension fields
-        "commitTs": 163963314122145239,
+        "commitTs": 429918007904436226, // A TiDB TSO timestamp
         "onlyHandleKey": true
     }
 }