tools: deprecate ndn-tlv-peek and ndn-tlv-poke

refs #2817

Change-Id: Iee198533659320bf2e9219b92195e06a3ba2b25f
diff --git a/docs/manpages/ndn-tlv-peek.rst b/docs/manpages/ndn-tlv-peek.rst
index 9b2a7e4..b2edd2d 100644
--- a/docs/manpages/ndn-tlv-peek.rst
+++ b/docs/manpages/ndn-tlv-peek.rst
@@ -1,6 +1,12 @@
 ndn-tlv-peek
 ============
 
+Deprecated
+----------
+
+ndn-tlv-peek is deprecated and will be removed in a future release of NFD.
+Please use ``ndnpeek`` program from ndn-tools repository `<https://github.com/named-data/ndn-tools>`__.
+
 Usage
 -----