diff --git a/extensions/libxt_CHAOS.man b/extensions/libxt_CHAOS.man
index 302e69f..0430c66 100644
--- a/extensions/libxt_CHAOS.man
+++ b/extensions/libxt_CHAOS.man
@@ -16,3 +16,6 @@ connections than they can.
 .PP
 The randomness factor of not replying vs. replying can be set during load-time
 of the xt_CHAOS module or during runtime in /sys/modules/xt_CHAOS/parameters.
+.PP
+See http://jengelh.medozas.de/projects/chaostables/ for more information
+about CHAOS, DELUDE and portscan.
diff --git a/extensions/libxt_IPMARK.man b/extensions/libxt_IPMARK.man
index 34eba24..ac4a532 100644
--- a/extensions/libxt_IPMARK.man
+++ b/extensions/libxt_IPMARK.man
@@ -7,31 +7,31 @@ This target is to be used inside the \fBmangle\fP table.
 \fB--addr\fP {\fBsrc\fP|\fBdst\fP}
 Select source or destination IP address as a basis for the mark.
 .TP
-.BI "--and-mask " "mask"
-Perform bitwise `and' on the IP address and this mask.
+\fB--and-mask\fP \fImask\fP
+Perform bitwise AND on the IP address and this bitmask.
 .TP
-.BI "--or-mask " "mask"
-Perform bitwise `or' on the IP address and this mask.
+\fB--or-mask\fP \fImask\fP
+Perform bitwise OR on the IP address and this bitmask.
 .TP
 \fB--shift\fP \fIvalue\fP
 Shift addresses to the right by the given number of bits before taking it
 as a mark. (This is done before ANDing or ORing it.) This option is needed
 to select part of an IPv6 address, because marks are only 32 bits in size.
-.P
+.PP
 The order of IP address bytes is reversed to meet "human order of bytes":
-192.168.0.1 is 0xc0a80001. At first the `and' operation is performed, then
-`or'.
-
+192.168.0.1 is 0xc0a80001. At first the "AND" operation is performed, then
+"OR".
+.PP
 Examples:
-
+.PP
 We create a queue for each user, the queue number is adequate
 to the IP address of the user, e.g.: all packets going to/from 192.168.5.2
 are directed to 1:0502 queue, 192.168.5.12 -> 1:050c etc.
-
+.PP
 We have one classifier rule:
 .IP
 tc filter add dev eth3 parent 1:0 protocol ip fw
-.P
+.PP
 Earlier we had many rules just like below:
 .IP
 iptables -t mangle -A POSTROUTING -o eth3 -d 192.168.5.2 -j MARK
@@ -39,12 +39,12 @@ iptables -t mangle -A POSTROUTING -o eth3 -d 192.168.5.2 -j MARK
 .IP
 iptables -t mangle -A POSTROUTING -o eth3 -d 192.168.5.3 -j MARK
 --set-mark 0x10503
-.P
+.PP
 Using IPMARK target we can replace all the mangle/mark rules with only one:
 .IP
-iptables -t mangle -A POSTROUTING -o eth3 -j IPMARK --addr=dst
---and-mask=0xffff --or-mask=0x10000
-.P
+iptables -t mangle -A POSTROUTING -o eth3 -j IPMARK --addr dst
+--and-mask 0xffff --or-mask 0x10000
+.PP
 On the routers with hundreds of users there should be significant load
 decrease (e.g. twice).
 .PP