diff --git a/_Sidebar.md b/_Sidebar.md
index d4ac55a..53cc8cb 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -1,5 +1,5 @@
 - [**Home**](./)
-- [**An Introduction to Mail Servers**](./introduction)
+- [**An Introduction to Mail Servers**](./Introduction)
 
 ---