diff --git a/docs/topics/downloader-middleware.rst b/docs/topics/downloader-middleware.rst
index 06e614941..9645ed5fd 100644
--- a/docs/topics/downloader-middleware.rst
+++ b/docs/topics/downloader-middleware.rst
@@ -684,11 +684,14 @@ HttpCompressionMiddleware
    This middleware allows compressed (gzip, deflate) traffic to be
    sent/received from web sites.
 
-   This middleware also supports decoding `brotli-compressed`_ responses,
-   provided `brotlipy`_ is installed.
+   This middleware also supports decoding `brotli-compressed`_ as well as
+   `zstd-compressed`_ responses, provided that `brotlipy`_ or `zstd`_ is
+   installed, respectively.
 
 .. _brotli-compressed: https://www.ietf.org/rfc/rfc7932.txt
 .. _brotlipy: https://pypi.org/project/brotlipy/
+.. _zstd-compressed: https://www.ietf.org/rfc/rfc8478.txt
+.. _zstd: https://pypi.org/project/zstd/
 
 HttpCompressionMiddleware Settings
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~