diff --git a/Doc/Sdi/dns.xml b/Doc/Sdi/dns.xml
index c6af8bb5ead2369eaf92951a2533debe381e164d..0f33f56f1644f162d313d0c6f8db8a17515728b8 100644
--- a/Doc/Sdi/dns.xml
+++ b/Doc/Sdi/dns.xml
@@ -256,8 +256,8 @@ $TTL    604800
         </glossentry>
 
         <glossentry>
-          <glossterm>www4_1.mi.hdm-stuttgart.de and
-          www4_2.mi.hdm-stuttgart.de</glossterm>
+          <glossterm>www4-1.mi.hdm-stuttgart.de and
+          www4-2.mi.hdm-stuttgart.de</glossterm>
 
           <glossdef>
             <para><code>CNAME</code> aliases.</para>