diff --git a/Biblio/9/8890.xml b/Biblio/9/8890.xml
index 4431bcb543d4..cf8f0fac1f97 100644
--- a/Biblio/9/8890.xml
+++ b/Biblio/9/8890.xml
@@ -17,6 +17,14 @@
     <forename>Pieter Johannes</forename>
     <surname>Sijpesteijn</surname>
   </author>
+  <editor n="1">
+    <forename>John R.</forename>
+    <surname>Rea</surname>
+  </editor>
+  <editor n="2">
+    <forename>Pieter Johannes</forename>
+    <surname>Sijpesteijn</surname>
+  </editor>
   <date>1976</date>
   <pubPlace n="1">Wien</pubPlace>
   <publisher n="1">Österreichische Nationalbibliothek; Hollinek i. Komm.</publisher>