diff --git a/composer.json b/composer.json
index 0c61121..aee1b3b 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,8 @@
     "netcommons/topics": "dev-master",
     "netcommons/workflow": "dev-master"
   },
-  "license": "NetCommons License",
+  "license": "LicenseRef-NetCommons",
+  "license-ref-net-commons": "https://raw.githubusercontent.com/NetCommons3/NetCommons3/master/license.txt",
   "authors": [
     {
       "name": "Ryuji AMANO (RYUS INC.)",