diff --git a/README.md b/README.md
index 5a654fe..bf8e84c 100644
--- a/README.md
+++ b/README.md
@@ -89,8 +89,8 @@ sudo dnf install gcc libX11-devel libXcursor-devel libXrandr-devel \
 sudo pacman -S gcc libx11 libxcursor libxrandr libxinerama mesa libxi
 ```
 
-On Windows, use a MinGW-w64 toolchain (for example via
-[MSYS2](https://www.msys2.org/)) so cgo has a C compiler.
+Windows needs a MinGW-w64 toolchain and has no `make` — it gets [its own
+section below](#building-on-windows).
 
 On macOS the command line tools cover the C side entirely — there is no
 Homebrew formula to add for graphics. That makes it easy to run
@@ -132,6 +132,77 @@ Without `make`, the equivalent is:
 go build -trimpath -ldflags "-s -w" -o bin/haul ./cmd/haul
 ```
 
+### Building on Windows
+
+Windows differs from the instructions above in three ways: cgo needs a
+MinGW-w64 compiler, there is no `make`, and a GUI build needs an extra linker
+flag to suppress the console window. All three are covered here.
+
+**1. Install Go.** Either
+
+```powershell
+winget install GoLang.Go
+```
+
+or the `.msi` from [go.dev/dl](https://go.dev/dl/), which puts Go on `PATH` for
+you. Open a **new** terminal afterwards, then check with `go version`.
+
+**2. Install a C compiler.** Go's cgo needs a GCC-style compiler —
+**MSVC/`cl.exe` will not work.** [MSYS2](https://www.msys2.org/) is the usual
+source:
+
+```powershell
+winget install MSYS2.MSYS2
+```
+
+Then open the **"MSYS2 UCRT64"** shell from the Start menu and install GCC:
+
+```sh
+pacman -S mingw-w64-ucrt-x86_64-gcc
+```
+
+Add its `bin` directory to your Windows `PATH` so the normal Go toolchain can
+find it — in PowerShell, as your user:
+
+```powershell
+[Environment]::SetEnvironmentVariable("Path",
+  [Environment]::GetEnvironmentVariable("Path","User") + ";C:\msys64\ucrt64\bin",
+  "User")
+```
+
+Open a new terminal and confirm both are visible:
+
+```powershell
+go version
+gcc --version
+```
+
+**3. Build.** Windows has no `make`, so invoke the compiler directly from
+PowerShell in the repo root:
+
+```powershell
+go build -trimpath -ldflags "-s -w -H=windowsgui" -o bin\haul.exe .\cmd\haul
+```
+
+Then run `.\bin\haul.exe`.
+
+Two details in that command matter:
+
+- **`-H=windowsgui`** marks the binary as a GUI application. Without it Windows
+  opens a console window behind haul every time it launches. The Makefile does
+  not pass this, because it targets Unix — so on Windows prefer the command
+  above even if you do have `make`.
+- **`-o bin\haul.exe`** names the output explicitly. Windows needs the `.exe`
+  extension to execute a file.
+
+If you would rather use the Makefile, install `make` inside the MSYS2 shell
+(`pacman -S make`) and build from there — but you will still want to add
+`-H=windowsgui` yourself, for example
+`make build LDFLAGS="-s -w -H=windowsgui"`.
+
+Unlike Linux, Windows needs no graphics development packages: OpenGL is part of
+the operating system.
+
 ### Make targets
 
 | Target            | Does                                                     |