diff --git a/Prepare-base-image-for-the-private-registry.md b/Prepare-base-image-for-the-private-registry.md
index 32b2f97..1cc0818 100644
--- a/Prepare-base-image-for-the-private-registry.md
+++ b/Prepare-base-image-for-the-private-registry.md
@@ -13,4 +13,6 @@ On the SJTU server:
 ```
 docker image load --input image.tar.gz
 docker push focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest
-```
\ No newline at end of file
+```
+
+We can also find mirror sites from <https://www.coderjia.cn/archives/dba3f94c-a021-468a-8ac6-e840f85867ea>.
\ No newline at end of file