diff --git a/setup.py b/setup.py
index ec1d2c819..8191d3888 100755
--- a/setup.py
+++ b/setup.py
@@ -178,8 +178,10 @@ setup(
     #   embedart: ImageMagick
     #   absubmit: extractor binary from https://acousticbrainz.org/download
     #   keyfinder: KeyFinder
-    #   replaygain: python-gi and GStreamer 1.0+ or mp3gain/aacgain
+    #   replaygain: python-gi and GStreamer 1.0+
+    #               or mp3gain/aacgain
     #               or Python Audio Tools
+    #               or ffmpeg
     #   ipfs: go-ipfs
 
     classifiers=[
@@ -196,6 +198,7 @@ setup(
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: Implementation :: CPython',
     ],
 )