diff --git a/docs/INSTALL.rst b/docs/INSTALL.rst
index 3fb4e59..25438da 100644
--- a/docs/INSTALL.rst
+++ b/docs/INSTALL.rst
@@ -22,7 +22,7 @@
 -  Fedora >= 29
 -  Gentoo Linux
 -  Raspberry Pi OS (formerly Raspbian) >= 2019-06-20
--  FreeBSD >= 11.3
+-  FreeBSD >= 12.0
 -  macOS 10.14
 
 Prerequisites
@@ -31,8 +31,8 @@
 Required
 ~~~~~~~~
 
--  GCC >= 7.4 or clang >= 4.0 (on Linux and FreeBSD)
--  Xcode >= 9.0 (on macOS)
+-  GCC >= 7.4 or clang >= 6.0 (if you are on Linux or FreeBSD)
+-  Xcode >= 11.3 or corresponding version of Command Line Tools (if you are on macOS)
 -  Python >= 3.6
 -  pkg-config
 -  Boost >= 1.65.1
diff --git a/docs/conf.py b/docs/conf.py
index 22f4bc1..95639c1 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -18,7 +18,7 @@
 # -- Project information -----------------------------------------------------
 
 project = u'ndn-cxx: NDN C++ library with eXperimental eXtensions'
-copyright = u'Copyright © 2013-2021 Regents of the University of California.'
+copyright = u'Copyright © 2013-2022 Regents of the University of California.'
 author = u'Named Data Networking Project'
 
 # The short X.Y version.
diff --git a/docs/doxygen.conf.in b/docs/doxygen.conf.in
index 82513e4..5c857c5 100644
--- a/docs/doxygen.conf.in
+++ b/docs/doxygen.conf.in
@@ -774,7 +774,7 @@
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = ndn-cxx
+INPUT                  = ndn-cxx build/ndn-cxx/version.hpp
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses