Release notes for Gerrit 2.8.6.1

Change-Id: I625ac1ad8b84e81902d4c936c214ff242098de2f
diff --git a/ReleaseNotes/index.txt b/ReleaseNotes/index.txt
index 368d153..7931681 100644
--- a/ReleaseNotes/index.txt
+++ b/ReleaseNotes/index.txt
@@ -4,6 +4,7 @@
 [[2_8]]
 Version 2.8.x
 -------------
+* link:ReleaseNotes-2.8.6.1.html[2.8.6.1]
 * link:ReleaseNotes-2.8.6.html[2.8.6]
 * link:ReleaseNotes-2.8.5.html[2.8.5]
 * link:ReleaseNotes-2.8.4.html[2.8.4]