diff --git a/README.md b/README.md
index e053c81..acdc6ef 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Weather mod for indoor check depends on sunlight propogation check. Some nodes (
 
 License of source code:
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-LGPL
+LGPL 2.1+
 
 Authors of media files:
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