diff --git a/en/SUMMARY.md b/en/SUMMARY.md
index f03314c..b599107 100644
--- a/en/SUMMARY.md
+++ b/en/SUMMARY.md
@@ -107,6 +107,7 @@
 
 * [Backend](development/backend/README.md)
   * [DifySandbox](development/backend/sandbox/README.md)
+    * [Contribution Guide](development/backend/sandbox/contribution.md)
 
 ## Learn More
 
diff --git a/jp/SUMMARY.md b/jp/SUMMARY.md
index 601c8a3..dcccc6f 100644
--- a/jp/SUMMARY.md
+++ b/jp/SUMMARY.md
@@ -106,6 +106,7 @@
 
 * [バックエンド](development/backend/README.md)
   * [DifySandbox](development/backend/sandbox/README.md)
+    * [貢献ガイド](development/backend/sandbox/contribution.md)
 
 ## もっと読む <a href="#learn-more" id="learn-more"></a>
 
diff --git a/zh_CN/SUMMARY.md b/zh_CN/SUMMARY.md
index 7671e66..0985820 100644
--- a/zh_CN/SUMMARY.md
+++ b/zh_CN/SUMMARY.md
@@ -106,6 +106,7 @@
 
 * [后端](development/backend/README.md)
   * [DifySandbox](development/backend/sandbox/README.md)
+    * [贡献指南](development/backend/sandbox/contribution.md)
 
 ## 阅读更多 <a href="#learn-more" id="learn-more"></a>