diff --git a/src/lib/schemas/user.js b/src/lib/schemas/user.js
index f4e7f5e..0252cee 100644
--- a/src/lib/schemas/user.js
+++ b/src/lib/schemas/user.js
@@ -64,7 +64,8 @@ export class User extends Types.Schema {
             new Types.Attribute("string", "region", {description: "The state or region component."}),
             new Types.Attribute("string", "postalCode", {description: "The zip code or postal code component."}),
             new Types.Attribute("string", "country", {description: "The country name component."}),
-            new Types.Attribute("string", "type", {canonicalValues: ["work", "home", "other"], description: "A label indicating the attribute's function, e.g. 'work' or 'home'."})
+            new Types.Attribute("string", "type", {canonicalValues: ["work", "home", "other"], description: "A label indicating the attribute's function, e.g. 'work' or 'home'."}),
+            new Types.Attribute("boolean", "primary", {description: "A Boolean value indicating the 'primary' or preferred attribute value for this attribute, e.g. the preferred mailing address or primary email address. The primary attribute value 'true' MUST appear no more than once."})
         ]),
         new Types.Attribute("complex", "groups", {direction: "out", mutable: false, multiValued: true, uniqueness: false, description: "A list of groups to which the user belongs, either through direct membership, through nested groups, or dynamically calculated."}, [
             new Types.Attribute("string", "value", {direction: "out", mutable: false, description: "The identifier of the User's group."}),
diff --git a/test/lib/schemas/user.json b/test/lib/schemas/user.json
index 39d5ee2..5fe42c4 100644
--- a/test/lib/schemas/user.json
+++ b/test/lib/schemas/user.json
@@ -235,6 +235,10 @@
             "name": "type", "type": "string", "multiValued": false, "required": false, "caseExact": false,
             "canonicalValues": ["work", "home", "other"], "mutability": "readWrite", "returned": "default", "uniqueness": "none",
             "description": "A label indicating the attribute's function, e.g. 'work' or 'home'."
+          },
+          {
+            "name": "primary", "type": "boolean", "multiValued": false, "required": false, "mutability": "readWrite", "returned": "default",
+            "description": "A Boolean value indicating the 'primary' or preferred attribute value for this attribute, e.g. the preferred mailing address or primary email address. The primary attribute value 'true' MUST appear no more than once."
           }
         ]
       },