diff --git a/setup.py b/setup.py
index 39665c36..84b0b4aa 100644
--- a/setup.py
+++ b/setup.py
@@ -74,7 +74,7 @@ setup(
         "Operating System :: MacOS :: MacOS X",
         "Operating System :: Microsoft :: Windows",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3 :: Only",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",