diff --git a/AUTHORS b/AUTHORS
index b044537..860a789 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -121,3 +121,4 @@ that much better:
  * Anton Kolechkin
  * Sergey Nikitin
  * psychogenic
+ * Stefan Wójcik
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 2f0f597..aa37af9 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -4,7 +4,7 @@ Changelog
 
 Changes in 0.7.X
 =================
-
+- Added NotUniqueError for duplicate keys (MongoEngine/mongoengine#62)
 - Added custom collection / sequence naming for SequenceFields (MongoEngine/mongoengine#92)
 - Fixed UnboundLocalError in composite index with pk field (MongoEngine/mongoengine#88)
 - Updated ReferenceField's to optionally store ObjectId strings