diff --git a/docweb/main.ent b/docweb/main.ent
index b441797cb9..4452865d7e 100644
--- a/docweb/main.ent
+++ b/docweb/main.ent
@@ -46,6 +46,7 @@ navigation'>
 navigation'>
 <!ENTITY docweb.common.header.credits 'Website Credits'>
 <!ENTITY docweb.common.header.copyright 'Copyright'>
+<!ENTITY docweb.common.header.error 'Error'>
 
 <!-- common.footer -->
 <!ENTITY docweb.common.footer.copyright 'Copyright'>
@@ -111,3 +112,5 @@ notices in the respective manuals for more information. In case you have
 questions not handled in the licenses, please ask at
 &docweb.common.link.doc-license;.'>    
   
+<!-- error codes -->
+<!ENTITY docweb.error.404 'File Not Found'>