diff --git a/doc/en/arch_tcpip.html b/doc/en/arch_tcpip.html
index ce975d0a..e4393e77 100644
--- a/doc/en/arch_tcpip.html
+++ b/doc/en/arch_tcpip.html
@@ -31,7 +31,7 @@ stack. These are the services provided by the TCP/IP stack:</p>
   be used instead. To use only the static configuration (and make the eLua image
   size a bit smaller) don't define the BUILD_DHCPC client.</p></li>
 
-<li><b>#define BUILD_DNSM</b> if you want support for the DNS server.</li>
+<li><b>#define BUILD_DNS</b> if you want support for the DNS server.</li>
 <li><b>#define BUILD_CON_TCP</b> if you want support for shell over telnet instead of
    serial. Note that you must NOT define <b>BUILD_CON_GENERIC</b> in this case (see
    <a href="arch_con_term.html">here</a> for details).</li>