diff --git a/docs/design_docs/graphs/time_stamp_struct.jpg b/docs/design_docs/graphs/time_stamp_struct.jpg
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diff --git a/docs/design_docs/graphs/time_stamp_struct.png b/docs/design_docs/graphs/time_stamp_struct.png
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diff --git a/docs/design_docs/milvus_timesync_en.md b/docs/design_docs/milvus_timesync_en.md
index bdda4a86f0..c61529939d 100644
--- a/docs/design_docs/milvus_timesync_en.md
+++ b/docs/design_docs/milvus_timesync_en.md
@@ -65,7 +65,7 @@ message AllocTimestampResponse {
 
 This is the format of `Timestamp`
 
-![Timestamp struct](./graphs/time_stamp_struct.png)
+![Timestamp struct](./graphs/time_stamp_struct.jpg)
 
 In an `AllocTimestamp` request, if `AllocTimestampRequest.count` is greater than `1`, `AllocTimestampResponse.timestamp` indicates the first available timestamp in the response.