diff --git a/README.md b/README.md
index c10c2e8..aa6fcd1 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,8 @@ git submodule update --init --recursive
 
 Using Godot v4.4.beta1.official [d33da79d3](https://github.com/godotengine/godot/commit/d33da79d3f8fe84be2521d25b9ba8e440cf25a88).
 Install SCons with `pipx install scons`.
+You will need a C++ compiler, you might have one already on Linux, see below for Windows, otherwise in [Godot documentation](https://docs.godotengine.org/en/stable/contributing/development/compiling/index.html).
+
 For updating MAVLink generator, you additionally `pip install future`.
 It is recommended to install any packages in a [virtual environment](https://docs.python.org/3/library/venv.html), for example:
 
@@ -31,6 +33,12 @@ scons compile_commands      # after modifying SConstruct
 python update_mavlink.py    # after updating MAVLink dialect
 ```
 
+### Windows setup
+
+The most convenient way of getting a C++ compiler is via the LLVM-MinGW project (by the way, it optimizes the binary more).
+Download the `llvm-mingw-...-msvcrt-x86_64.zip` from the [Releases page](https://github.com/mstorsjo/llvm-mingw/releases).
+Unzip the archive to some location you like, and add its `bin` folder to `Path` using the "Edit environment variables for your account" program.
+
 ### Build
 
 To build the GDExtension binary run SCons in the repository root, the default arguments have been added to the file.
@@ -38,3 +46,9 @@ To build the GDExtension binary run SCons in the repository root, the default ar
 ```sh
 scons
 ```
+
+When building for Windows with MinGW-LLVM, you need to [select this compiler](https://docs.godotengine.org/en/stable/contributing/development/compiling/compiling_for_windows.html#selecting-a-compiler):
+
+```powershell
+scons platform=windows use_mingw=yes use_llvm=yes
+```