diff --git a/ndn_utils/client.conf.sample b/ndn_utils/client.conf.sample
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+; "transport" specifies Face's default transport connection.
+; The value is a unix or tcp4 scheme Face URI.
+;
+; For example:
+;
+;   unix:///var/run/nfd.sock
+;   tcp://192.0.2.1
+;   tcp4://example.com:6363
+
+transport=unix:///var/run/nfd.sock
+
+; "protocol" determines the protocol for prefix registration
+; it has a value of:
+;   nfd-0.1
+;   nrd-0.1
+;   ndnd-tlv-0.7
+;   ndnx-0.7
+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
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