diff --git a/README.md b/README.md
index af9e9c5..9af5b57 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,8 @@
 Double Exchange Hamiltonian: Complete Version
 =============================================
 
+(under GNU GENERAL PUBLIC LICENSE v2)
+
 1. Dependencies
 ---------------