diff --git a/doc/configuration.txt b/doc/configuration.txt
index 04acab7..e1e0d50 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -22151,8 +22151,8 @@
 socket type and the transport method.
 
 
-11.1 Address family prefixes
-----------------------------
+11.1. Address family prefixes
+-----------------------------
 
 'abns@<name>' following <name> is an abstract namespace (Linux only).
 
@@ -22187,8 +22187,8 @@
                start by slash '/'.
 
 
-11.2 Socket type prefixes
--------------------------
+11.2. Socket type prefixes
+--------------------------
 
 Previous "Address family prefixes" can also be prefixed to force the socket
 type and the transport method. The default depends of the statement using
@@ -22210,8 +22210,8 @@
                             to "datagram".
 
 
-11.3 Protocol prefixes
-----------------------
+11.3. Protocol prefixes
+-----------------------
 
 'tcp@<address>[:port1[-port2]]' following <address> is considered as an IPv4
                                 or IPv6 address depending of the syntax but