diff --git a/setup.py b/setup.py
index ddf4f4b..da01c25 100644
--- a/setup.py
+++ b/setup.py
@@ -33,6 +33,8 @@ setuptools.setup(
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: Implementation :: CPython',
+        'Programming Language :: Python :: Implementation :: PyPy',
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
         'Topic :: Software Development :: Debuggers',