diff --git a/components/Credential.yml b/components/Credential.yml
index f6a4711..fab6ed5 100644
--- a/components/Credential.yml
+++ b/components/Credential.yml
@@ -90,10 +90,13 @@ components:
           type: object
           description: The subject
         "proof":
+          type: object
           description: An optional proof for credentials that are secured using proof sets or chains.
           oneOf: 
             - type: object
             - type: array
+              items: 
+                type: object
       example:
         {
           "@context":
diff --git a/respec-oas.js b/respec-oas.js
index 61d33a2..eec80da 100644
--- a/respec-oas.js
+++ b/respec-oas.js
@@ -285,11 +285,16 @@ function renderJsonSchemaObject(schema) {
   } else if(schema.oneOf) {
     objectRendering += ' either ';
     let itemCount = 0;
-    for(item of schema.oneOf) {
+    for(const item of schema.oneOf) {
       if(item.type === 'string') {
         objectRendering += 'a string';
       } else if(item.type === 'object') {
         objectRendering += renderJsonSchemaObject(item);
+      } else if(item.type === 'array') {
+        objectRendering += 'an array';
+        if(item.items) {
+          objectRendering += ` of ${item.items.type}(s)`;
+        }
       }
 
       itemCount += 1;
@@ -307,7 +312,7 @@ function renderJsonSchemaObject(schema) {
       }
     } else {
       objectRendering += 'an object of the following form: <dl>';
-      for(property in schema.properties) {
+      for(const property in schema.properties) {
         const value = schema.properties[property];
         objectRendering += renderJsonSchemaProperty(property, value);
       }