2 files changed, 15 insertions, 9 deletions
diff --git a/src/data/things/track.js b/src/data/things/track.js
index 8d310611..f6320677 100644
--- a/src/data/things/track.js
+++ b/src/data/things/track.js
@@ -24,6 +24,7 @@ import {
 
 import {
   additionalFiles,
+  additionalNameList,
   commentary,
   commentatorArtists,
   contributionList,
@@ -63,6 +64,7 @@ export class Track extends Thing {
 
     name: name('Unnamed Track'),
     directory: directory(),
+    additionalNames: additionalNameList(),
 
     duration: duration(),
     urls: urls(),
diff --git a/src/data/things/validators.js b/src/data/things/validators.js
index f60c363c..71570c5a 100644
--- a/src/data/things/validators.js
+++ b/src/data/things/validators.js
@@ -96,7 +96,10 @@ export function isStringNonEmpty(value) {
 }
 
 export function optional(validator) {
-  return value => value === null || value === undefined || validator(value);
+  return value =>
+    value === null ||
+    value === undefined ||
+    validator(value);
 }
 
 // Complex types (non-primitives)
@@ -285,20 +288,14 @@ export function validateProperties(spec) {
 
 export const isContribution = validateProperties({
   who: isArtistRef,
-  what: (value) =>
-    value === undefined ||
-    value === null ||
-    isStringNonEmpty(value),
+  what: optional(isStringNonEmpty),
 });
 
 export const isContributionList = validateArrayItems(isContribution);
 
 export const isAdditionalFile = validateProperties({
   title: isString,
-  description: (value) =>
-    value === undefined ||
-    value === null ||
-    isString(value),
+  description: optional(isStringNonEmpty),
   files: validateArrayItems(isString),
 });
 
@@ -376,6 +373,13 @@ export function isURL(string) {
   return true;
 }
 
+export const isAdditionalName = validateProperties({
+  name: isName,
+  annotation: optional(isStringNonEmpty),
+});
+
+export const isAdditionalNameList = validateArrayItems(isAdditionalName);
+
 export function validateReference(type = 'track') {
   return (ref) => {
     isStringNonEmpty(ref);