diff --git a/docs/conf.py b/docs/conf.py
index 7712d74..f506208 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -242,9 +242,11 @@
     ('manpages/ndnsec-cert-gen',     'ndnsec-cert-gen',    'part of NDN security tools', None, 1),
     ('manpages/ndnsec-cert-install', 'ndnsec-cert-instal', 'part of NDN security tools', None, 1),
     ('manpages/ndnsec-delete',       'ndnsec-delete',      'part of NDN security tools', None, 1),
-    ('manpages/ndnsec-export',       'ndnsec-export',      'part of NDN security tools', None, 1),
+    ('manpages/ndnsec-export',       'ndnsec-export',
+     'export a certificate and its private key to a file', None, 1),
     ('manpages/ndnsec-get-default',  'ndnsec-get-default', 'part of NDN security tools', None, 1),
-    ('manpages/ndnsec-import',       'ndnsec-import',      'part of NDN security tools', None, 1),
+    ('manpages/ndnsec-import',       'ndnsec-import',
+     'import a certificate and its private key from a file', None, 1),
     ('manpages/ndnsec-key-gen',      'ndnsec-key-gen',     'part of NDN security tools', None, 1),
     ('manpages/ndnsec-list',         'ndnsec-list',        'part of NDN security tools', None, 1),
     ('manpages/ndnsec-set-default',  'ndnsec-set-default', 'part of NDN security tools', None, 1),
diff --git a/docs/manpages/ndnsec-export.rst b/docs/manpages/ndnsec-export.rst
index 839e381..fb3c41f 100644
--- a/docs/manpages/ndnsec-export.rst
+++ b/docs/manpages/ndnsec-export.rst
@@ -1,43 +1,42 @@
 ndnsec-export
 =============
 
-``ndnsec-export`` is a tool to export an identity's security data
-
 Usage
 -----
 
 ::
 
-    $ ndnsec-export [-h] [-o output] [-p] identity
+    $ ndnsec-export [-h] [-o output] identity
 
 Description
 -----------
 
-``ndnsec-export`` can export public data of the ``identity`` including default key/certificate.
-``ndnsec-export`` can also export sensitive data (such as private key), but the sensitive data will
-be encrypted. The exported identity can be imported again using ``ndnsec-import``.
-
-By default, the command will write exported data to standard output.
+``ndnsec-export`` exports the default certificate of an identity and its private key as a file. It
+will ask for a passphrase to encrypt the private key. The output file can be imported again with
+``ndnsec-import`` command.
 
 Options
 -------
 
-``-o output``
-  Output the exported data to a file pointed by ``output``.
+``-h``
+  Print a help message.
 
-``-p``
-  Export private key of the identity. A password will be asked for data encryption.
+``-o output``
+  Write to an output file instead of the standard output.
+
+``identity``
+  The identity name.
 
 Examples
 --------
 
-Export an identity's security data including private key and store the security data in a file:
+Export an identity's default certificate and private key into a file:
 
 ::
 
-    $ ndnsec-export -o id.info -p /ndn/test/alice
+    $ ndnsec-export -o alice.ndnkey /ndn/test/alice
 
-Export an identity's security data without private key and write it to standard output:
+Export an identity's default certificate and private key to the standard output:
 
 ::
 
diff --git a/docs/manpages/ndnsec-import.rst b/docs/manpages/ndnsec-import.rst
index 5b61f59..fbc8bc9 100644
--- a/docs/manpages/ndnsec-import.rst
+++ b/docs/manpages/ndnsec-import.rst
@@ -1,33 +1,33 @@
 ndnsec-import
 =============
 
-``ndnsec-import`` is a tool to import an identity's security data that is prepared by
-``ndnsec-export``.
-
 Usage
 -----
 
 ::
 
-    $ ndnsec-import [-h] [-p] input
+    $ ndnsec-import [-h] input
 
 Description
 -----------
 
-``ndnsec-import`` read data from ``input``. It will ask for password if the input contains private
-key. If ``input`` is ``-``, security data will be read from standard input.
+``ndnsec-import`` imports a certificate and private key from a file created by ``ndnsec-export``. It
+will ask for the passphrase used to encrypt the private key.
 
 Options
 -------
 
-``-p``
-  Indicates the imported data containing private key. A password will be asked for data encryption.
+``-h``
+  Print a help message.
+
+``input``
+  Read from an input file. Specify ``-`` to read from the standard input.
 
 Examples
 --------
 
-Import an identity's security data including private key:
+Import a certificate and private key from a file:
 
 ::
 
-    $ ndnsec-import -p input_file
+    $ ndnsec-import alice.ndnkey