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+client.conf
+===========
+
+System configuration of NDN platform is specified in ``client.conf``.
+Here is an example of ``client.conf`` for current ndn-cxx package:
+
+::
+
+    ; "unix_socket" specifies the location of the NFD unix socket
+    unix_socket=/var/run/nfd.sock
+
+    ; "protocol" determines the protocol for prefix registration
+    ; it has a value of:
+    ;   nrd-0.1
+    protocol=nrd-0.1
+
+    ; "pib" determines which Public Info Base (PIB) should used by default in applications.
+    ; If "pib" is not specified, the default PIB will be used.
+    ; Note that default PIB could be different on different system.
+    ; If "pib" is specified, it may have a value of:
+    ;   sqlite3
+    ; pib=sqlite3
+
+    ; "tpm" determines which Trusted Platform Module (TPM) should used by default in applications.
+    ; If "tpm" is not specified, the default TPM will be used.
+    ; Note that default TPM could be different on different system.
+    ; If "tpm" is specified, it may have a value of:
+    ;   file
+    ;   osx-keychain
+    ; tpm=file
+
+NFD
+---
+
+unix_socket
+  The local interface of NFD to applications. By default, the path to the socket is ``/var/run/nfd.sock``.
+
+Prefix Registration
+-------------------
+
+protocol
+  The prefix registration protocol. For now, only one protocol ``nrd-0.1`` is supported.
+  With this protocol, applications send prefix registration requests to NRD.
+  NRD, after authenticating the request, will set up corresponding FIB entries in NFD.
+
+Key Management
+--------------
+
+tpm
+  Trusted Platform Module (TPM) where the private keys are stored.
+  Two options are currently available: ``file`` and ``osx-keychain``.
+  **Users are not supposed to change the ``tpm`` setting once it is configued,
+  otherwise users may face the problem of "Keys are not found".**
+  The default value of ``tpm`` depends on the operating system.
+  For OS X, the default value is ``osx-keychain``.
+  For other systems, the default value is ``file``.
+
+pib
+  The public key information for each private key stored in TPM.
+  There is only one option for ``pib``: ``sqlite3``, which is also the default value of ``pib``.
+
+Users are not supposed to change the configuration of Key Management.
+If changes is inevitable, please clean up the all the existing data (which is usually under ``~/.ndn/``):
+
+::
+
+    rm -rf ~/.ndn/ndnsec-*