Add more detail about change assignee in 2.14 release notes

Change-Id: Ia9ac1f85d9d3f00f71778622fbc1a9b424ec01d4
diff --git a/releases/2.14.md b/releases/2.14.md
index 8548c4d..f86840e 100644
--- a/releases/2.14.md
+++ b/releases/2.14.md
@@ -29,6 +29,15 @@
 
 ### Change Assignee
 
+Changes may be assigned to a specific user. This allows a workflow where the
+user that is assigned to a change is responsible for reviewing the change and/or
+passing the assignment on to another user.
+
+In the UI, changes assigned to the currently logged in user are highlighted.
+
+A new `assignee:` search predicate allows to find changes assigned to a given
+user.
+
 ### Emails
 
 Gerrit email messages are made easier to read by sending HTML content parts in
@@ -40,6 +49,15 @@
 
 ### Secondary Index with Elastic Search
 
+### REST API
+
+#### Changes
+
+* [Get Assignee](https://gerrit-documentation.storage.googleapis.com/Documentation/2.14/rest-api-changes.html#get-assignee)
+* [Get Past Assignees](https://gerrit-documentation.storage.googleapis.com/Documentation/2.14/rest-api-changes.html#get-past-assignees)
+* [Set Assignee](https://gerrit-documentation.storage.googleapis.com/Documentation/2.14/rest-api-changes.html#set-assignee)
+* [Delete Assignees](https://gerrit-documentation.storage.googleapis.com/Documentation/2.14/rest-api-changes.html#delete-assignee)
+
 ### New User Interface ("PolyGerrit")
 
 Gerrit now includes a new user interface, referred to as "PolyGerrit", based on