add license badge

1 files changed, 1 insertions, 0 deletions

diff --git a/README.md b/README.md
index 8cb4299..74bade8 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@
 [![PyPI Statistics](https://img.shields.io/pypi/dm/dnspython.svg)](https://pypistats.org/packages/dnspython)
 [![Build Status](https://dev.azure.com/halley0415/halley/_apis/build/status/rthalley.dnspython?branchName=master)](https://dev.azure.com/halley0415/halley/_build/latest?definitionId=1&branchName=master)
 [![Coverage](https://codecov.io/github/rthalley/dnspython/coverage.svg?branch=master)](https://codecov.io/gh/rthalley/dnspython)
+[![License: ISC](https://img.shields.io/badge/License-ISC-green.svg)](https://opensource.org/licenses/ISC)
 
 ## INTRODUCTION