diff --git a/chapter07/network.xml b/chapter07/network.xml
index e8ee50248..3f476d550 100644
--- a/chapter07/network.xml
+++ b/chapter07/network.xml
@@ -165,7 +165,7 @@ EOF</userinput></screen>
     gateway IP address, if one is present. If not, then comment out the
     variable entirely.</para>
 
-    <para>The <envar>PREFIX</envar> variable containis the number of
+    <para>The <envar>PREFIX</envar> variable contains the number of
     bits used in the subnet. Each octet in an IP address is 8 bits. If the
     subnet's netmask is 255.255.255.0, then it is using the first three octets
     (24 bits) to specify the network number. If the netmask is 255.255.255.240,