diff --git a/man/man1/turnadmin.1 b/man/man1/turnadmin.1
index 53f6635..f328c60 100644
--- a/man/man1/turnadmin.1
+++ b/man/man1/turnadmin.1
@@ -1,5 +1,5 @@
 .\" Text automatically generated by txt2man
-.TH TURN 1 "12 March 2021" "" ""
+.TH TURN 1 "02 June 2021" "" ""
 .SH GENERAL INFORMATION
 
 \fIturnadmin\fP is a TURN administration tool. This tool can be used to manage
diff --git a/man/man1/turnserver.1 b/man/man1/turnserver.1
index 0bac0ed..7edeac6 100644
--- a/man/man1/turnserver.1
+++ b/man/man1/turnserver.1
@@ -1,5 +1,5 @@
 .\" Text automatically generated by txt2man
-.TH TURN 1 "12 March 2021" "" ""
+.TH TURN 1 "02 June 2021" "" ""
 .SH GENERAL INFORMATION
 
 The \fBTURN Server\fP project contains the source code of a TURN server and TURN client
@@ -45,6 +45,16 @@ $ ./scripts/secure_relay.sh
 If the systemd development library is available, then it will notify systemd about the server status.
 .SH RUNNING THE TURN SERVER
 
+To run the coturn server as a daemon use:
+.PP
+.nf
+.fam C
+  $ turnserver \-o
+
+.fam T
+.fi
+Note that if you make any changes to the config file the server has to be restarted.
+.PP
 Options note: \fIturnserver\fP has long and short option names, for most options.
 Some options have only long form, some options have only short form. Their syntax
 somewhat different, if an argument is required:
@@ -867,12 +877,24 @@ Web\-admin server port. Default is 8080.
 .B
 \fB\-\-web\-admin\-listen\-on\-workers\fP
 Enable for web\-admin server to listens on STUN/TURN workers STUN/TURN ports.
-By default it is disabled for security resons!
+By default it is disabled for security reasons!
 (This behavior used to be the default behavior, and was enabled by default.)
 .TP
 .B
 \fB\-\-ne\fP=[1|2|3]
 Set network engine type for the process (for internal purposes).
+.TP
+.B
+\fB\-\-no\-rfc5780\fP
+Disable RFC5780 (NAT behavior discovery).
+Originally, if there are more than one listener address from the same
+address family, then by default the NAT behavior discovery feature enabled.
+This option disables this original behavior, because the NAT behavior discovery
+adds attributes to response, and this increase the possibility of an amplification attack.
+Strongly encouraged to use this option to decrease gain factor in STUN binding responses.
+.RE
+.PP
+
 .SH ==================================
 
 .SH LOAD BALANCE AND PERFORMANCE TUNING
diff --git a/man/man1/turnutils.1 b/man/man1/turnutils.1
index 370b851..597be93 100644
--- a/man/man1/turnutils.1
+++ b/man/man1/turnutils.1
@@ -1,5 +1,5 @@
 .\" Text automatically generated by txt2man
-.TH TURN 1 "12 March 2021" "" ""
+.TH TURN 1 "02 June 2021" "" ""
 .SH GENERAL INFORMATION
 
 A set of turnutils_* programs provides some utility functionality to be used