diff --git a/_toc.yml b/_toc.yml
index 5635ddd..80111ff 100644
--- a/_toc.yml
+++ b/_toc.yml
@@ -6,15 +6,15 @@ format: jb-book
 
 chapters:
     - file: user-guide/index
-        sections:
-          - file: user-guide/login_servers
-          - file: user-guide/evolution_for_o365
-          - file: user-guide/thunderbird_for_o365
-          - file: user-guide/ssh_host_key_certificates
-          - file: user-guide/ssh_client_config
-          - file: user-guide/firefox_profile_per_host
-          - file: user-guide/kerberos_lifetime
-          - file: user-guide/putty
+      sections:
+        - file: user-guide/login_servers
+        - file: user-guide/evolution_for_o365
+        - file: user-guide/thunderbird_for_o365
+        - file: user-guide/ssh_host_key_certificates
+        - file: user-guide/ssh_client_config
+        - file: user-guide/firefox_profile_per_host
+        - file: user-guide/kerberos_lifetime
+        - file: user-guide/putty
 
     - file: admin-guide/index
       sections: