diff --git a/library.properties b/library.properties
index c9913f89..78d54048 100644
--- a/library.properties
+++ b/library.properties
@@ -2,6 +2,7 @@ name=Embedded Template Library
 version=10.21.2
 author= John Wellbelove <john.wellbelove@etlcpp.com>
 maintainer=John Wellbelove <john.wellbelove@etlcpp.com>
+license=MIT
 sentence=A C++ template library tailored for embedded systems.
 paragraph=Requires some support from STL. See http://andybrown.me.uk/2011/01/15/the-standard-template-library-stl-for-avr-with-c-streams/ or https://github.com/mike-matera/ArduinoSTL.git for Arduino.
 category=Other