diff --git a/installer/data/mysql/en/optional/marc21_relatorterms.yml b/installer/data/mysql/en/optional/marc21_relatorterms.yml
index 4f3af4ac79..4970dd1209 100644
--- a/installer/data/mysql/en/optional/marc21_relatorterms.yml
+++ b/installer/data/mysql/en/optional/marc21_relatorterms.yml
@@ -1190,6 +1190,10 @@ tables:
           authorised_value: "wat"
           lib: "Writer of added text"
 
+        - category: "RELTERMS"
+          authorised_value: "waw"
+          lib: "Writer of afterword"
+
         - category: "RELTERMS"
           authorised_value: "wdc"
           lib: "Woodcutter"