diff --git a/README.md b/README.md
index 55ede0f..03a9bfd 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,8 @@ This repository is a scientific product and is not official communication of the
 
 ### License
 
-This content was created by U.S. Government employees as part of their official duties. This content is not subject to copyright in the United States (17 U.S.C. §105) and is in the public domain within the United States of America. Additionally, copyright is waived worldwide through the CC0 1.0 Universal public domain dedication.
+This content was created by U.S. Government employees as part of their official duties. This content is not subject to copyright in the United States (17 U.S.C. §105) and is in the public domain within the United States of America. The rCAX package as a whole is distributed under [GNU GENERAL PUBLIC
+LICENSE version 3](https://www.tldrlegal.com/license/gnu-general-public-license-v3-gpl-3) (GPL-3).