diff --git a/AUTHORS b/AUTHORS
index 91993e2e..de001348 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -118,3 +118,4 @@ that much better:
  * Tommi Komulainen
  * Peter Landry
  * biszkoptwielki
+ * Anton Kolechkin
diff --git a/docs/changelog.rst b/docs/changelog.rst
index f1609aea..dc2f7f3d 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -5,6 +5,7 @@ Changelog
 Changes in 0.7.X
 =================
 
+- Fixed UnboundLocalError in composite index with pk field (MongoEngine/mongoengine#88)
 - Updated ReferenceField's to optionally store ObjectId strings
   this will become the default in 0.8 (MongoEngine/mongoengine#89)
 - Added FutureWarning - save will default to `cascade=False` in 0.8