Replace --debugmsg with WINEDEBUG.

diff --git a/documentation/configuring.sgml b/documentation/configuring.sgml
index c957f21..4f69529 100644
--- a/documentation/configuring.sgml
+++ b/documentation/configuring.sgml
@@ -662,8 +662,8 @@
             are all optional and you probably don't need to add or
             remove anything in this section to your config.</emphasis> (In extreme
             cases you may want to use these options to manage the amount
-            of information generated by the <parameter>--debugmsg +relay
-            </parameter> option.)
+            of information generated by <parameter>WINEDEBUG=+relay
+            </parameter> )
           </para>
           <para>
             <programlisting>"File" = "/blanco"</programlisting>
@@ -683,13 +683,13 @@
           <para>
             <programlisting>"RelayInclude" = "user32.CreateWindowA;comctl32.*"</programlisting>
             Include only the listed functions in a
-            <parameter>--debugmsg +relay</parameter> trace.  This entry is
+            <parameter>WINEDEBUG=+relay</parameter> trace.  This entry is
             ignored if there is a <parameter>RelayExclude</parameter> entry.
           </para>
           <para>
             <programlisting>"RelayExclude" = "RtlEnterCriticalSection;RtlLeaveCriticalSection"</programlisting>
             Exclude the listed functions in a
-            <parameter>--debugmsg +relay</parameter> trace.  This entry
+            <parameter>WINEDEBUG=+relay</parameter> trace.  This entry
             overrides any settings in a <parameter>RelayInclude</parameter>
             entry.  If neither entry is present then the trace includes
             everything.
@@ -1277,8 +1277,8 @@
         <itemizedlist>
           <listitem>
             <para>
-              Run the program with <parameter>--debugmsg
-                +loaddll</parameter> to find out which files are
+              Run the program with <parameter>WINEDEBUG=+loaddll</parameter>
+              to find out which files are
               needed. Copy the required DLLs one by one to the
               <filename>C:\windows\system</filename> directory. Do not
               copy KERNEL/KERNEL32, GDI/GDI32, USER/USER32 or NTDLL. These
@@ -1698,8 +1698,8 @@
 <para>
   A very useful help to find out which DLLs are loaded as built-in and
   which are loaded as native Windows file can be the debug channel
-  loaddll, activated via the Wine command line parameter
-  <command>--debugmsg +loaddll</command>.
+  loaddll, activated via the environment variable
+  <command>WINEDEBUG=+loaddll</command>.
 </para>
 </sect2>