diff --git a/doc/latex/dns.tex b/doc/latex/dns.tex
index e1f0106..229469d 100644
--- a/doc/latex/dns.tex
+++ b/doc/latex/dns.tex
@@ -79,6 +79,7 @@ the library. The supertype of these conditions is \exi{dns-error}.
 
 \section{High-level Interface}
 \def\ipaddr{IP-address\xspace}
+\def\ipstring{IP-string\xspace}
 \def\fqdn{FQDN\xspace}
 
 The library uses an internal store to cache data obtained from DNS
@@ -104,20 +105,20 @@ accept. \var{Nameserver} is either a \ipaddr or a dotted IP string.
   to the ones found in \texttt{/etc/resolv.conf}. 
 \end{desc}
 
-\defun{dns-lookup-ip}{\ipaddr [nameserver list][use-cache?]}{\fqdn}
+\defun{dns-lookup-ip}{\ipstring/\ipaddr [nameserver list][use-cache?]}{\fqdn}
 \begin{desc}
   Looks up the FQDN for the given IP address. The optional argument
   specifes the name servers to query, it defaults to the ones found in
   \texttt{/etc/resolv.conf}.
 \end{desc}
 
-\defun{dns-lookup-nameserver}{name/\ipaddr [nameserver list][use-cache?]}{\ipaddr list}
+\defun{dns-lookup-nameserver}{\ipstring/\ipaddr [nameserver list][use-cache?]}{\ipaddr list}
 \begin{desc}
   Looks up an authoritative name server for a hostname, returns a list
   of name servers.
 \end{desc}
 
-\defun{dns-lookup-mail-exchanger}{name/\ipaddr [nameserver list][use-cache?]}{\fqdn list}
+\defun{dns-lookup-mail-exchanger}{\ipstring/\ipaddr [nameserver list][use-cache?]}{\fqdn list}
 \begin{desc}
   Looks up mail-exchangers for a hostname und returns them in a list
   sorted by preference.
@@ -129,8 +130,8 @@ accept. \var{Nameserver} is either a \ipaddr or a dotted IP string.
   obtain the information.
 \end{desc}
 
-\defun{maybe-dns-lookup-name}{name [nameserver list][use-cache?]}{\ipaddr or \sharpf}
-\defunx{maybe-dns-lookup-ip}{\ipaddr [nameserver list][use-cache?]}{\fqdn{} or \sharpf}
+\defun{maybe-dns-lookup-name}{\fqdn [nameserver list][use-cache?]}{\ipaddr or \sharpf}
+\defunx{maybe-dns-lookup-ip}{\ipstring/\ipaddr [nameserver list][use-cache?]}{\fqdn{} or \sharpf}
 \begin{desc}
   These procedures provide the same functionality as
   \ex{dns-lookup-name} and \ex{dns-lookup-ip} but return \sharpf{} in
@@ -181,7 +182,7 @@ generating the \var{dns-message}.
   \ex{network-protocol} with the possible protocol names \ex{tcp} and
   \ex{udp}.
 \end{desc}
-\defun{dns-lookup}{\fqdn{}/\ipaddr type [nameserver list][use-cache?]}{dns-message}
+\defun{dns-lookup}{\ipstring/\ipaddr type [nameserver list][use-cache?]}{dns-message}
 \begin{desc}
   Convenient shortcut to submit a DNS query. The return value
   is a \ex{dns-message} structure: