diff --git a/README.md b/README.md
index 4abba80..bc82aa9 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,8 @@
 
 This is an asynchronous adapter for [pycasbin](https://pypi.org/project/casbin) using Tortoise ORM.
 
+Supports Python 3.7+.
+
 ## Installation
 
 ```sh