diff --git a/src/main/resources/alma/fix/describedBy.fix b/src/main/resources/alma/fix/describedBy.fix
index 6e679cbd8..2ed31afcf 100644
--- a/src/main/resources/alma/fix/describedBy.fix
+++ b/src/main/resources/alma/fix/describedBy.fix
@@ -40,7 +40,7 @@ if any_match("008", "^\\d{6}\\D.*") # 008/00-05 is the correct form for the cata
   substring("@initialCataloguingDate","0","6")
 end
 
-if any_match("@initialCataloguingDate","^[0-4]\\d(0[1-9]|1[012])(0[1-9]|[12][0-9]|3[01])") # Complete dates after 2000
+if any_match("@initialCataloguingDate","^[0-4]\\d(0[1-9]|1[012])(0[1-9]|[12][0-9]|3[01])") # Assume dates from 2000-01-01 to  2049-12-31 ( e.g. matching 491231)
   prepend("@initialCataloguingDate","20")
 elsif any_match("@initialCataloguingDate","\\d{2}(0[1-9]|1[012])(0[1-9]|[12][0-9]|3[01])") # Complete dates before 2000
   prepend("@initialCataloguingDate","19")