diff --git a/README.md b/README.md
index e4c56babb448..cfb292ad9242 100644
--- a/README.md
+++ b/README.md
@@ -1,45 +1,45 @@
 FreeBSD Source:
 ---------------
 This is the top level of the FreeBSD source directory.
 
 FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms.
 A large community has continually developed it for more than thirty years.
 Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
 
 For copyright information, please see [the file COPYRIGHT](COPYRIGHT) in this directory.
 Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
 
 The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree.
 See build(7), config(8), [FreeBSD handbook on building userland](https://docs.freebsd.org/en/books/handbook/cutting-edge/#makeworld), and [Handbook for kernels](https://docs.freebsd.org/en/books/handbook/kernelconfig/) for more information, including setting make(1) variables.
 
 For information on the CPU architectures and platforms supported by FreeBSD, see the [FreeBSD
 website's Platforms page](https://www.freebsd.org/platforms/).
 
 Source Roadmap:
 ---------------
 | Directory | Description |
 | --------- | ----------- |
 | bin | System/user commands. |
 | cddl | Various commands and libraries under the Common Development and Distribution License. |
 | contrib | Packages contributed by 3rd parties. |
 | crypto | Cryptography stuff (see [crypto/README](crypto/README)). |
 | etc | Template files for /etc. |
 | gnu | Commands and libraries under the GNU General Public License (GPL) or Lesser General Public License (LGPL).  Please see gnu/COPYING* for more information. |
 | include | System include files. |
 | kerberos5 | Kerberos5 (Heimdal) package. |
 | lib | System libraries. |
 | libexec | System daemons. |
 | release | Release building Makefile & associated tools. |
 | rescue | Build system for statically linked /rescue utilities. |
 | sbin | System commands. |
 | secure | Cryptographic libraries and commands. |
 | share | Shared resources. |
 | stand | Boot loader sources. |
-| sys | Kernel sources. |
+| sys | Kernel sources (see [sys/README.md](sys/README.md)). |
 | sys/`arch`/conf | Kernel configuration files. GENERIC is the configuration used in release builds. NOTES contains documentation of all possible entries. |
 | tests | Regression tests which can be run by Kyua.  See [tests/README](tests/README) for additional information. |
 | tools | Utilities for regression testing and miscellaneous tasks. |
 | usr.bin | User commands. |
 | usr.sbin | System administration commands. |
 
 For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see [FreeBSD Handbook](https://docs.freebsd.org/en/books/handbook/cutting-edge/#current-stable).
diff --git a/sys/README.md b/sys/README.md
new file mode 100644
index 000000000000..398281752cab
--- /dev/null
+++ b/sys/README.md
@@ -0,0 +1,34 @@
+FreeBSD Kernel Source:
+----------------------
+
+This directory contains the source files and build glue that make up the FreeBSD
+kernel and its modules, including both original and contributed software.
+
+Source Roadmap:
+---------------
+| Directory | Description |
+| --------- | ----------- |
+| amd64 | AMD64 architecture support |
+| arm | ARM architecture support |
+| arm64 | ARMv8 architecture support |
+| cam | `cam(4)` and `ctl(4)` |
+| cddl | CDDL-licensed optional sources, including ZFS and DTrace |
+| ddb | `ddb(4)` |
+| fs | most filesystems |
+| dev | device drivers |
+| geom | `geom(4)` |
+| i386 | i386 (32 bit) architecture support |
+| kern | main part of the kernel |
+| net80211 | `net80211(4)` |
+| netgraph | `netgraph(4)` |
+| netinet | `inet(4)` |
+| netinet6 | `inet6(4)` |
+| netipsec | `ipsec(4)` |
+| netpfil | `ipfw(4)` and `pf(4)` |
+| opencrypto | `crypto(7)` |
+| powerpc | PowerPC/POWER architecture support |
+| riscv | RISC-V architecture support |
+| security | `audit(4)` and `mac(4)` |
+| sys | kernel headers |
+| ufs | Unix File System |
+| x86 | code shared by AMD64 and i386 architectures |