diff --git a/apiary.apib b/apiary.apib
index 9a8eaab..fa86b05 100644
--- a/apiary.apib
+++ b/apiary.apib
@@ -1631,6 +1631,7 @@ For example you should create a group for the Introduction to Programming course
         + signup_url_show (boolean, optional) - Show or hide the sign up url. The supported values are `true`, `false` and `null`.
         + course_link_show (boolean, optional) - This links the credential data record to your information about the credential on your website. The supported values are `true`, `false` and `null`.
         + organization_link_show (boolean, optional) - Show or hide the link to your website homepage. The supported values are `true`, `false` and `null`.
+        + allow_duplicate_credentials (boolean, optional) - An email address can receive more than one credential. The supported values are `true` & `false`. Defaults to `false`.
 
     + Body
 
@@ -1772,6 +1773,7 @@ For example you should create a group for the Introduction to Programming course
         + signup_url_show (boolean, optional) - Show or hide the sign up url. The supported values are `true`, `false` and `null`.
         + course_link_show (boolean, optional) - This links the credential data record to your information about the credential on your website. The supported values are `true`, `false` and `null`.
         + organization_link_show (boolean, optional) - Show or hide the link to your website homepage. The supported values are `true`, `false` and `null`.
+        + allow_duplicate_credentials (boolean, optional) - An email address can receive more than one credential. The supported values are `true` & `false`. Defaults to `false`.
 
     + Body
 
@@ -1887,6 +1889,7 @@ You can clone a group using this action. Add attributes to override cloned value
         + signup_url_show (boolean, optional) - Show or hide the sign up url. The supported values are `true`, `false` and `null`.
         + course_link_show (boolean, optional) - This links the credential data record to your information about the credential on your website. The supported values are `true`, `false` and `null`.
         + organization_link_show (boolean, optional) - Show or hide the link to your website homepage. The supported values are `true`, `false` and `null`.
+        + allow_duplicate_credentials (boolean, optional) - An email address can receive more than one credential. The supported values are `true` & `false`. Defaults to `false`.
 
     + Body