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+# Supported platforms
+
+|  System | Support type | Supported versions | Notes |
+|---|---|---|---|
+| GNU/Linux | Tier 1 | Linux >= 3.10 with glibc >= 2.17 | |
+| macOS | Tier 1 | macOS >= 11 | Currently supported macOS releases |
+| Windows | Tier 1 | >= Windows 10 | VS 2017 and later are supported |
+| FreeBSD | Tier 2 | >= 12 | |
+| AIX | Tier 2 | >= 6 | Maintainers: @libuv/aix |
+| IBM i | Tier 2 | >= IBM i 7.2 | Maintainers: @libuv/ibmi |
+| z/OS | Tier 2 | >= V2R2 | Maintainers: @libuv/zos |
+| Linux with musl | Tier 2 | musl >= 1.0 | |
+| Android | Tier 3 | NDK >= r15b | Android 7.0, `-DANDROID_PLATFORM=android-24` |
+| MinGW | Tier 3 | MinGW-w64 | |
+| SunOS | Tier 3 | Solaris 121 and later | |
+| Other | Tier 3 | N/A | |
+
+## Support types
+
+* **Tier 1**: Officially supported and tested with CI. Any contributed patch
+  MUST NOT break such systems. These are supported by @libuv/collaborators.
+
+* **Tier 2**: Officially supported, but not necessarily tested with CI. These
+  systems are maintained to the best of @libuv/collaborators ability,
+  without being a top priority.
+
+* **Tier 3**: Community maintained. These systems may inadvertently break and the
+  community and interested parties are expected to help with the maintenance.
+
+## Adding support for a new platform
+
+**IMPORTANT**: Before attempting to add support for a new platform please open
+an issue about it for discussion.
+
+### Unix
+
+I/O handling is abstracted by an internal `uv__io_t` handle. The new platform
+will need to implement some of the functions, the prototypes are in
+``src/unix/internal.h``.
+
+If the new platform requires extra fields for any handle structure, create a
+new include file in ``include/`` with the name ``uv-theplatform.h`` and add
+the appropriate defines there.
+
+All functionality related to the new platform must be implemented in its own
+file inside ``src/unix/`` unless it's already done in a common file, in which
+case adding an `ifdef` is fine.
+
+Two build systems are supported: autotools and cmake. Ideally both need to be
+supported, but if one of the two does not support the new platform it can be
+left out.
+
+### Windows
+
+Windows is treated as a single platform, so adding support for a new platform
+would mean adding support for a new version.
+
+Compilation and runtime must succeed for the minimum supported version. If a
+new API is to be used, it must be done optionally, only in supported versions.
+
+### Common
+
+Some common notes when adding support for new platforms:
+
+* Generally libuv tries to avoid compile time checks. Do not add any to the
+  autotools based build system or use version checking macros.
+  Dynamically load functions and symbols if they are not supported by the
+  minimum supported version.