diff --git a/winbuild/README.md b/winbuild/README.md
index 611d1ed1a..118b28708 100644
--- a/winbuild/README.md
+++ b/winbuild/README.md
@@ -11,6 +11,8 @@ For more extensive info, see the [Windows build instructions](build.rst).
 * Requires Microsoft Visual Studio 2017 or newer with C++ component.
 * Requires NASM for libjpeg-turbo, a required dependency when using this script.
 * Requires CMake 3.12 or newer (available as Visual Studio component).
+* Requires zstd static link library installed.
+* Requires libdeflate static library installed.
 * Tested on Windows Server 2016 with Visual Studio 2017 Community (AppVeyor).
 * Tested on Windows Server 2019 with Visual Studio 2019 Enterprise (GitHub Actions).