diff --git a/_Sidebar.md b/_Sidebar.md
index b9d4286..d2284ee 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -18,7 +18,7 @@
   * [[Filer Commands and Operations]]
   * [[Mount]]
   * [[Amazon S3 API]]
-    * [[S3cmd]]
+    * [[s3cmd]]
   * [[Migrate to Filer Store]]
   * [[Add New Filer Store|Customize Filer Store]]
   * [[Hadoop Compatible File System]]