diff --git a/source/index.rst b/source/index.rst
index 45b82fb4..cf4d18f3 100644
--- a/source/index.rst
+++ b/source/index.rst
@@ -19,9 +19,10 @@ Contents
 
    1/Installing_lubuntu
    2/Applications
-   3/System_Tools_and_Prefrences.rst
+   3/System_Tools_and_Prefrences
    4/Installing_Updating_and_Removing_Software
    5/Panel_Desktop_and_Runner
+   D/upgrading
 
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