Prepare release 0.8.1

Refs: #5250
Change-Id: I99931c1300cd752554aea764e9688d027b5de29e
diff --git a/docs/releases.rst b/docs/releases.rst
index 32356db..7f8905e 100644
--- a/docs/releases.rst
+++ b/docs/releases.rst
@@ -2,12 +2,18 @@
 ====================
 
 .. toctree::
-    :glob:
-    :hidden:
-    :maxdepth: 1
-    :reversed:
+   :glob:
+   :hidden:
+   :maxdepth: 1
+   :reversed:
 
-    release-notes/*
+   release-notes/*
+
+* **ndn-cxx version 0.8.1**
+  (:doc:`Release Notes <release-notes/release-notes-0.8.1>`, `Documentation <https://named-data.net/doc/ndn-cxx/0.8.1/>`__)
+
+  `src (git) <https://github.com/named-data/ndn-cxx/releases/tag/ndn-cxx-0.8.1>`__,
+  `src (tarball) <https://named-data.net/downloads/ndn-cxx-0.8.1.tar.bz2>`__ (`checksum <https://named-data.net/downloads/ndn-cxx-0.8.1.tar.bz2.sha256>`__)
 
 * **ndn-cxx version 0.8.0**
   (:doc:`Release Notes <release-notes/release-notes-0.8.0>`, `Documentation <https://named-data.net/doc/ndn-cxx/0.8.0/>`__)