1 files changed, 1 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index 02ebcc7d..c5ee1058 100644
--- a/setup.py
+++ b/setup.py
@@ -77,6 +77,7 @@ setup(
         "Topic :: Security :: Cryptography",
         "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",