diff --git a/README.turnutils b/README.turnutils
index a21fdc9..76f9c8a 100644
--- a/README.turnutils
+++ b/README.turnutils
@@ -34,8 +34,8 @@ $ ./scripts/secure_relay.sh
 
 5.	turnutils_natdiscovery: a utility that provides NAT behavior discovery
 according RFC5780. This utility discovers the actual NAT Mapping and Filtering
-behavior. Be aweare that at least two different listening IP addresses should
-be configured to be able to work properly!
+behavior, etc. Be aware that on TURN server side two different listening IP
+addresses should be configured to be able to work properly!
 
 6.	turnutils_oauth: a utility that provides OAuth access_token 
 generation(AEAD encryption), validation and decryption. This utility inputs 
@@ -272,19 +272,30 @@ Flags:
 
 -f  NAT filtering behavior discovery
 
+-t  NAT mapping lifetime behavior discovery
+    Requires a timer (-T)
+
 -c  NAT collision behavior discovery
 
 -H  NAT hairpinning behavior discovery
 
+-P  Add 1500 byte Padding to the behavior discovery
+    Applicable with all except NAT mapping Lifetime discovery
+
 Options with required values:
 
 -p  STUN server port (Default: 3478)
 
 -L  Local address to use (optional)
 
+-l  Local port to use (use with -L)
+
 -A  Secondary Local address (optional)
     Required for collision discovery
 
+-T  Mapping lifetime timer (sec)
+    Used by mapping lifetime behavior discovery
+
 Usage:
 
 $ turnutils_natdiscovery -m -f stun.example.com
diff --git a/man/man1/turnutils.1 b/man/man1/turnutils.1
index 371397a..fc9c9ec 100644
--- a/man/man1/turnutils.1
+++ b/man/man1/turnutils.1
@@ -46,8 +46,8 @@ $ ./scripts/secure_relay.sh
 5.
 \fIturnutils_natdiscovery\fP: a utility that provides NAT behavior discovery
 according RFC5780. This utility discovers the actual NAT Mapping and Filtering
-behavior. Be aweare that at least two different listening IP addresses should
-be configured to be able to work properly!
+behavior, etc. Be aware that on TURN server side two different listening IP
+addresses should be configured to be able to work properly!
 .TP
 .B
 6.
@@ -418,12 +418,22 @@ NAT mapping behavior discovery
 NAT filtering behavior discovery
 .TP
 .B
+\fB\-t\fP
+NAT mapping lifetime behavior discovery
+Requires a timer (\fB\-T\fP)
+.TP
+.B
 \fB\-c\fP
 NAT collision behavior discovery
 .TP
 .B
 \fB\-H\fP
 NAT hairpinning behavior discovery
+.TP
+.B
+\fB\-P\fP
+Add 1500 byte Padding to the behavior discovery
+Applicable with all except NAT mapping Lifetime discovery
 .PP
 Options with required values:
 .TP
@@ -436,9 +446,18 @@ STUN server port (Default: 3478)
 Local address to use (optional)
 .TP
 .B
+\fB\-l\fP
+Local port to use (use with \fB\-L\fP)
+.TP
+.B
 \fB\-A\fP
 Secondary Local address (optional)
 Required for collision discovery
+.TP
+.B
+\fB\-T\fP
+Mapping lifetime timer (sec)
+Used by mapping lifetime behavior discovery
 .PP
 Usage:
 .PP
@@ -650,5 +669,6 @@ Mutsutoshi Yoshimoto <mutsutoshi.yoshimoto@mixi.co.jp>
 Federico Pinna <fpinna@vivocha.com>
 .PP
 Bradley T. Hughes <bradleythughes@fastmail.fm>
+.RE
 .PP
 Mihaly Meszaros <bakfitty@gmail.com>