diff --git a/PLATFORM_SUPPORT.md b/PLATFORM_SUPPORT.md
new file mode 100644
index 0000000000..358e0c4db1
--- /dev/null
+++ b/PLATFORM_SUPPORT.md
@@ -0,0 +1,53 @@
+# Platform/Architecture Support
+
+Platform support on `winit` has two tiers: Tier 1 and Tier 2.
+
+- Tier 1 is **guaranteed to work**. Targets in this tier are actively tested
+  both in CI and by maintainers.
+- Tier 2 is **guaranteed to build**. Code compilation is tested in CI, but deeper
+  testing is not done.
+
+Please open an issue if you would like to add a Tier 2 target, or if you would
+like a Tier 2 target moved to Tier 1.
+
+## Tier 1 Targets
+
+|Target Name                    |Target Triple                       |APIs           |
+|-------------------------------|------------------------------------|---------------|
+|32-Bit x86 Windows with MSVC   |`i686-pc-windows-msvc`              |Win32          |
+|64-Bit x86 Windows with MSVC   |`x86_64-pc-windows-msvc`            |Win32          |
+|32-Bit x86 Windows with glibc  |`i686-pc-windows-gnu`               |Win32          |
+|64-Bit x86 Windows with glibc  |`x86_64-pc-windows-gnu`             |Win32          |
+|32-Bit x86 Linux with glibc    |`i686-unknown-linux-gnu`            |X11, Wayland   |
+|64-Bit x86 Linux with glibc    |`x86_64-unknown-linux-gnu`          |X11, Wayland   |
+|64-Bit ARM Android             |`aarch64-linux-android`             |Android        |
+|64-Bit x86 Redox OS            |`x86_64-unknown-redox`              |Orbital        |
+|64-bit x64 macOS               |`x86_64-apple-darwin`               |AppKit         |
+|64-bit ARM macOS               |`aarch64-apple-darwin`              |AppKit         |
+|64-bit x64 iOS                 |`x86_64-apple-ios`                  |UIKit          |
+|64-bit ARM iOS                 |`aarch64-apple-ios`                 |UIKit          |
+|32-bit WASM web browser        |`wasm32-unknown-unknown`            |DOM            |
+
+## Tier 2 Targets
+
+|Target Name                         |Target Triple                       |APIs           |
+|------------------------------------|------------------------------------|---------------|
+|64-Bit ARM Windows with MSVC        |`aarch64-pc-windows-msvc`           |Win32          |
+|32-Bit x86 Windows 7 with MSVC      |`i686-win7-windows-msvc`            |Win32          |
+|64-Bit x86 Windows 7 with MSVC      |`x86_64-win7-windows-msvc`          |Win32          |
+|64-bit x86 Linux with Musl          |`x86_64-unknown-linux-musl`         |X11, Wayland   |
+|64-bit x86 Linux with 32-bit glibc  |`x86_64-unknown-linux-gnux32`       |X11, Wayland   |
+|64-bit x86 Android                  |`x86_64-linux-android`              |Android        |
+|32-bit x86 Android                  |`i686-linux-android`                |Android        |
+|64-bit x86 FreeBSD                  |`x86_64-unknown-freebsd`            |X11, Wayland   |
+|64-bit x86 NetBSD                   |`x86_64-unknown-netbsd`             |X11            |
+|32-bit x86 Linux with Musl          |`i686-unknown-linux-musl`           |X11, Wayland   |
+|64-bit RISC-V Linux with glibc      |`riscv64gc-unknown-linux-gnu`       |X11, Wayland   |
+|64-bit ARM Linux with glibc         |`aarch64-unknown-linux-gnu`         |X11, Wayland   |
+|64-bit ARM Linux with Musl          |`aarch64-unknown-linux-musl`        |X11, Wayland   |
+|64-bit PowerPC Linux with glibc     |`powerpc64le-unknown-linux-gnu`     |X11, Wayland   |
+|32-Bit ARM Linux with glibc         |`armv5te-unknown-linux-gnueabi`     |X11, Wayland   |
+|64-Bit Linux on IBM Supercomputers  |`s390x-unknown-linux-gnu`           |X11, Wayland   |
+|32-bit ARM Android                  |`arm-linux-androideabi`             |Android        |
+|64-bit SPARC Linux with glibc       |`sparc64-unknown-linux-gnu`         |X11, Wayland   |
+
diff --git a/src/lib.rs b/src/lib.rs
index f747c13928..b03e86b04e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -147,6 +147,59 @@
 //! See the [`platform`] module for documentation on platform-specific cargo
 //! features.
 //!
+//! # Platform/Architecture Support
+//!
+//! Platform support on `winit` has two tiers: Tier 1 and Tier 2.
+//!
+//! - Tier 1 is **guaranteed to work**. Targets in this tier are actively tested both in CI and by
+//!   maintainers.
+//! - Tier 2 is **guaranteed to build**. Code compilation is tested in CI, but deeper testing is not
+//!   done.
+//!
+//! Please open an issue if you would like to add a Tier 2 target, or if you would
+//! like a Tier 2 target moved to Tier 1.
+//!
+//! ## Tier 1 Targets
+//!
+//! |Target Name                    |Target Triple                       |APIs           |
+//! |-------------------------------|------------------------------------|---------------|
+//! |32-Bit x86 Windows with MSVC   |`i686-pc-windows-msvc`              |Win32          |
+//! |64-Bit x86 Windows with MSVC   |`x86_64-pc-windows-msvc`            |Win32          |
+//! |32-Bit x86 Windows with glibc  |`i686-pc-windows-gnu`               |Win32          |
+//! |64-Bit x86 Windows with glibc  |`x86_64-pc-windows-gnu`             |Win32          |
+//! |32-Bit x86 Linux with glibc    |`i686-unknown-linux-gnu`            |X11, Wayland   |
+//! |64-Bit x86 Linux with glibc    |`x86_64-unknown-linux-gnu`          |X11, Wayland   |
+//! |64-Bit ARM Android             |`aarch64-linux-android`             |Android        |
+//! |64-Bit x86 Redox OS            |`x86_64-unknown-redox`              |Orbital        |
+//! |64-bit x64 macOS               |`x86_64-apple-darwin`               |AppKit         |
+//! |64-bit ARM macOS               |`aarch64-apple-darwin`              |AppKit         |
+//! |64-bit x64 iOS                 |`x86_64-apple-ios`                  |UIKit          |
+//! |64-bit ARM iOS                 |`aarch64-apple-ios`                 |UIKit          |
+//! |32-bit WASM web browser        |`wasm32-unknown-unknown`            |DOM            |
+//!
+//! ## Tier 2 Targets
+//!
+//! |Target Name                         |Target Triple                       |APIs           |
+//! |------------------------------------|------------------------------------|---------------|
+//! |64-Bit ARM Windows with MSVC        |`aarch64-pc-windows-msvc`           |Win32          |
+//! |32-Bit x86 Windows 7 with MSVC      |`i686-win7-windows-msvc`            |Win32          |
+//! |64-Bit x86 Windows 7 with MSVC      |`x86_64-win7-windows-msvc`          |Win32          |
+//! |64-bit x86 Linux with Musl          |`x86_64-unknown-linux-musl`         |X11, Wayland   |
+//! |64-bit x86 Linux with 32-bit glibc  |`x86_64-unknown-linux-gnux32`       |X11, Wayland   |
+//! |64-bit x86 Android                  |`x86_64-linux-android`              |Android        |
+//! |32-bit x86 Android                  |`i686-linux-android`                |Android        |
+//! |64-bit x86 FreeBSD                  |`x86_64-unknown-freebsd`            |X11, Wayland   |
+//! |64-bit x86 NetBSD                   |`x86_64-unknown-netbsd`             |X11            |
+//! |32-bit x86 Linux with Musl          |`i686-unknown-linux-musl`           |X11, Wayland   |
+//! |64-bit RISC-V Linux with glibc      |`riscv64gc-unknown-linux-gnu`       |X11, Wayland   |
+//! |64-bit ARM Linux with glibc         |`aarch64-unknown-linux-gnu`         |X11, Wayland   |
+//! |64-bit ARM Linux with Musl          |`aarch64-unknown-linux-musl`        |X11, Wayland   |
+//! |64-bit PowerPC Linux with glibc     |`powerpc64le-unknown-linux-gnu`     |X11, Wayland   |
+//! |32-Bit ARM Linux with glibc         |`armv5te-unknown-linux-gnueabi`     |X11, Wayland   |
+//! |64-Bit Linux on IBM Supercomputers  |`s390x-unknown-linux-gnu`           |X11, Wayland   |
+//! |32-bit ARM Android                  |`arm-linux-androideabi`             |Android        |
+//! |64-bit SPARC Linux with glibc       |`sparc64-unknown-linux-gnu`         |X11, Wayland   |
+//!
 //! [`EventLoop`]: event_loop::EventLoop
 //! [`EventLoop::new()`]: event_loop::EventLoop::new
 //! [`EventLoop::run_app()`]: event_loop::EventLoop::run_app