diff --git a/README.md b/README.md
index 099332c4d5..760171172e 100644
--- a/README.md
+++ b/README.md
@@ -58,7 +58,9 @@ CHANGES file format.
 For up-to-date versions and release notes, see
 [https://www.isc.org/download/](https://www.isc.org/download/).
 
-For information about supported platforms, see [PLATFORMS](PLATFORMS.md).
+For information about supported platforms, see the
+["Supported Platforms"](doc/arm/platforms.rst) section in the BIND 9
+Administrator Reference Manual.
 
 ### <a name="help"/> Reporting bugs and getting help
 
diff --git a/doc/arm/Makefile.am b/doc/arm/Makefile.am
index 894f0aeebc..c92797dfac 100644
--- a/doc/arm/Makefile.am
+++ b/doc/arm/Makefile.am
@@ -20,6 +20,7 @@ EXTRA_DIST =					\
 	manpages.rst				\
 	notes.rst				\
 	pkcs11.rst				\
+	platforms.rst				\
 	plugins.rst				\
 	reference.rst				\
 	requirements.rst			\
diff --git a/doc/arm/conf.py b/doc/arm/conf.py
index 43e9d62bfd..ce06ac4721 100644
--- a/doc/arm/conf.py
+++ b/doc/arm/conf.py
@@ -150,6 +150,7 @@ exclude_patterns = [
     'logging-cattegories.rst',
     'managed-keys.rst',
     'pkcs11.rst',
+    'platforms.rst',
     'plugins.rst'
     ]
 
diff --git a/doc/arm/notes.rst b/doc/arm/notes.rst
index 92e7489b1c..7a0c6a6f9e 100644
--- a/doc/arm/notes.rst
+++ b/doc/arm/notes.rst
@@ -27,23 +27,7 @@ detailed list of changes and bug fixes.
 Supported Platforms
 -------------------
 
-To build on Unix-like systems, BIND requires support for POSIX.1c
-threads (IEEE Std 1003.1c-1995), the Advanced Sockets API for IPv6
-(:rfc:`3542`), and standard atomic operations provided by the C
-compiler.
-
-The libuv asynchronous I/O library and the OpenSSL cryptography library
-must be available for the target platform. A PKCS#11 provider can be
-used instead of OpenSSL for Public Key cryptography (i.e., DNSSEC
-signing and validation), but OpenSSL is still required for general
-cryptography operations such as hashing and random number generation.
-
-More information can be found in the ``PLATFORMS.md`` file that is
-included in the source distribution of BIND 9. If your compiler and
-system libraries provide the above features, BIND 9 should compile and
-run. If that is not the case, the BIND development team will generally
-accept patches that add support for systems that are still supported by
-their respective vendors.
+See the :ref:`supported_os` section in the :ref:`Requirements` chapter.
 
 Download
 --------
diff --git a/doc/arm/platforms.rst b/doc/arm/platforms.rst
index a26f652e69..c5a5af8e5e 100644
--- a/doc/arm/platforms.rst
+++ b/doc/arm/platforms.rst
@@ -9,6 +9,8 @@
 .. See the COPYRIGHT file distributed with this work for additional
 .. information regarding copyright ownership.
 
+.. _supported_os:
+
 Supported platforms
 -------------------
 
diff --git a/doc/arm/requirements.rst b/doc/arm/requirements.rst
index fdd343def6..6151e593e0 100644
--- a/doc/arm/requirements.rst
+++ b/doc/arm/requirements.rst
@@ -9,7 +9,7 @@
 .. See the COPYRIGHT file distributed with this work for additional
 .. information regarding copyright ownership.
 
-.. Requirements:
+.. _Requirements:
 
 BIND Resource Requirements
 ==========================
@@ -70,6 +70,4 @@ much memory or CPU power as in the first alternative, but this has the
 disadvantage of making many more external queries, as none of the name
 servers share their cached data.
 
-.. _supported_os:
-
 .. include:: platforms.rst