diff --git a/backend/README.md b/backend/README.md
index 31be561b56e..a4e2bd4a467 100644
--- a/backend/README.md
+++ b/backend/README.md
@@ -42,7 +42,9 @@ This README provides a quick setup guide for the Omi backend. For a comprehensiv
 
 7. Install `opus` (required for audio processing)
    - Mac: `brew install opus`
-   - Windows: You should already have it if you're on Windows 10 version 1903 and above
+   - Windows: install a native `libopus` build and make sure its DLL directory is on `PATH`
+     - MSYS2 UCRT64 example: `pacman -S mingw-w64-ucrt-x86_64-opus`
+     - Add `C:\msys64\ucrt64\bin` to `PATH`, then verify from a new shell with `where.exe opus.dll`
 
 8. Move to the backend directory: `cd backend`
 
diff --git a/docs/doc/developer/backend/Backend_Setup.mdx b/docs/doc/developer/backend/Backend_Setup.mdx
index 4637c08bb3d..ea6ae870126 100644
--- a/docs/doc/developer/backend/Backend_Setup.mdx
+++ b/docs/doc/developer/backend/Backend_Setup.mdx
@@ -252,7 +252,11 @@ OAuth is required for user authentication. You need to configure both Google and
         ```powershell
         choco install python git.install ffmpeg
         ```
-        <Note>Opus is included in Windows 10 version 1903 and above.</Note>
+        <Note>
+          The Python `opuslib` package still needs a native `libopus` DLL on `PATH`. One common setup is MSYS2 UCRT64:
+          install MSYS2, run `pacman -S mingw-w64-ucrt-x86_64-opus`, add `C:\msys64\ucrt64\bin` to `PATH`,
+          then open a new shell and verify with `where.exe opus.dll`.
+        </Note>
       </Tab>
       <Tab title="Linux/Nix">
         Python, Git, and FFmpeg are typically pre-installed. Install opus via your package manager if needed.