diff --git a/doc/ReferenceOfClasses.md b/doc/ReferenceOfClasses.md
index 1733cd86..ab735574 100644
--- a/doc/ReferenceOfClasses.md
+++ b/doc/ReferenceOfClasses.md
@@ -714,9 +714,9 @@ Modification
 * `edit( [title, body, assignee, state, milestone, labels] )`
     * `title`: string
     * `body`: string
-    * `assignee`: `NamedUser`
+    * `assignee`: `NamedUser` or None
     * `state`: string
-    * `milestone`: `Milestone`
+    * `milestone`: `Milestone` or None
     * `labels`: list of string
 
 Class `IssueComment`
diff --git a/test/Issue.py b/test/Issue.py
index a60814b2..6ee4871d 100644
--- a/test/Issue.py
+++ b/test/Issue.py
@@ -55,6 +55,16 @@ class Issue( Framework.TestCase ):
         self.assertEqual( self.issue.title, "Title edited by PyGithub" )
         self.assertListKeyEqual( self.issue.labels, lambda l: l.name, [ "Bug" ] )
 
+    def testEditResetMilestone( self ):
+        self.assertEqual( self.issue.milestone.title, "Version 0.4" )
+        self.issue.edit( milestone = None )
+        self.assertEqual( self.issue.milestone, None )
+
+    def testEditResetAssignee( self ):
+        self.assertEqual( self.issue.assignee.login, "jacquev6" )
+        self.issue.edit( assignee = None )
+        self.assertEqual( self.issue.assignee, None )
+
     def testCreateComment( self ):
         comment = self.issue.create_comment( "Comment created by PyGithub" )
         self.assertEqual( comment.id, 5808311 )