diff --git a/docs/topics/downloader-middleware.rst b/docs/topics/downloader-middleware.rst
index 80c6c2c37..222dda685 100644
--- a/docs/topics/downloader-middleware.rst
+++ b/docs/topics/downloader-middleware.rst
@@ -1073,6 +1073,8 @@ In order to use this parser:
 * Set :setting:`ROBOTSTXT_PARSER` setting to
   ``scrapy.robotstxt.ReppyRobotParser``
 
+* only works with python 3.8 and earlier
+
 .. _rerp-parser:
 
 Robotexclusionrulesparser