diff --git a/doc/concepts/tls b/doc/concepts/tls
index 25946a2..d42d8de 100644
--- a/doc/concepts/tls
+++ b/doc/concepts/tls
@@ -3,53 +3,55 @@
         tls (transport layer security)
 
 DESCRIPTION
-	TLS stands for Transport Layer Security which is the successor
-	of the well known SSL (Secure Socket Layer). Both techniques 
-	provide a way to authenticate and encrypt the data send through
-	a network connection.
-	By enabling TLS during compilation of the driver you can provide
-	a secure channel into the mud to your players.
-	In difference to other solutions as "sslwrap" or "stunnel" the
-	driver integrated approach has the advantage that the mud sees 
-	the real IP of the player, not the IP of the local mud host.
+        TLS stands for Transport Layer Security which is the successor
+        of the well known SSL (Secure Socket Layer). Both techniques
+        provide a way to authenticate and encrypt the data send through
+        a network connection.
+
+        By enabling TLS during compilation of the driver you can provide
+        a secure channel into the mud to your players.
+
+        In difference to other solutions as "sslwrap" or "stunnel" the
+        driver integrated approach has the advantage that the mud sees
+        the real IP of the player, not the IP of the local mud host.
 
 USAGE
-	To use TLS configure your driver with --enable-tls option.
-	After starting your driver you have five new efuns
-	(tls_init_connection(), tls_deinit_connection(), tls_error(),
-	 tls_query_connection_info(), tls_query_connection_state()).
+        To use TLS configure your driver with --enable-tls option.
+        After starting your driver you have five new efuns
+        (tls_init_connection(), tls_deinit_connection(), tls_error(),
+        tls_query_connection_info(), tls_query_connection_state()).
 
-	You can switch on TLS by calling tls_init_connection().
-	This can happen in three ways:
+        You can switch on TLS by calling tls_init_connection().
+        This can happen in three ways:
 
-	1) in telnet_neg()
+        1) in telnet_neg()
 
-            Advantage of this method is that you can offer TLS on a normal 
-            mud port. If you have a limited number of ports this can 
-            become important. The TLS connection will be started by 
+            Advantage of this method is that you can offer TLS on a normal
+            mud port. If you have a limited number of ports this can
+            become important. The TLS connection will be started by
             the client with help of telnet option STARTTLS. Currently
             there are no mudclients that support this method.
-            
+
             You will have to implement the telnet option STARTTLS (46) for
             this method. The draft for this can be found here:
             http://www.ietf.org/proceedings/99mar/I-D/draft-ietf-tn3270e-telnet-tls-01.txt
             Call tls_init_connection() to initiate the TLS handshake.
 
 
-	2) in master_ob->connect()
+        2) in master_ob->connect()
 
             Advantage of this method is that your users can connect with
             any program that supports TLS/SSL. Examples are telnet-ssl,
             sslwrap or stunnel. Disadvantage is that you have to spend
             a dedicated port for this.
-            
+
             You have to call tls_init_connection() as first command
             after the player connected (normally in master_ob->connect())
 
         3) in an interactive object using a callback.
 
             This method is similar to method (1), but not limited to
-            telnet: it is useful for implementing protocols thta use
+            telnet: it is useful for implementing protocols that use
             STARTTLS like SMTP or IMAP. tls_init_connection() can be
             called at any time by the interactive object.