diff --git a/_config.yml b/_config.yml
index 7364101..24461ff 100644
--- a/_config.yml
+++ b/_config.yml
@@ -41,7 +41,14 @@ header_pages:
   - about.markdown
 
 sidebar:
-  - Alg1
+  - getting-started
+  - label: Customization
+    children:
+      - sidebar
+      - search
+      - relative-nav
+      - additional-config
+  - development
 
 
 # Exclude from processing.
diff --git a/index.markdown b/index.markdown
index cd8d9c4..6ff7e58 100644
--- a/index.markdown
+++ b/index.markdown
@@ -9,7 +9,7 @@ layout: default
 
 ## Algèbre
 
-### [Cours Algèbre 1](/courses/Maths_PSI_Alg1.markdown)
+### [Cours Algèbre 1](Alg1)
 
 ### [Exos Algèbre](/exercises/Maths_PSI_Alg_EX.markdown)