diff --git a/COPYING b/COPYING
index 67563f07..27a8f1d2 100644
--- a/COPYING
+++ b/COPYING
@@ -1,5 +1,5 @@
 The ParserFunctions extension may be copied and redistributed under the GNU
-General Public License.
+General Public License, version 2.0 or, at your option, any later version.
 
 -------------------------------------------------------------------------------
 
diff --git a/README b/README
index 9665c2f3..6794781c 100644
--- a/README
+++ b/README
@@ -5,7 +5,7 @@ ParserFunctions v1.4.0
 3. Tests
 
 1. Licensing
-Licensed under GNU GPL. See COPYING for more license information.
+Licensed under GNU GPL 2.0 or any later version. See COPYING for more license information.
 
 2. How to install
    a. Download this tarbell and extract the contents to $IP/extensions/ParserFunctions/
diff --git a/extension.json b/extension.json
index 6a5464a2..9b38c5a8 100644
--- a/extension.json
+++ b/extension.json
@@ -9,7 +9,7 @@
 	],
 	"url": "https://www.mediawiki.org/wiki/Extension:ParserFunctions",
 	"descriptionmsg": "pfunc_desc",
-	"license-name": "GPL-2.0",
+	"license-name": "GPL-2.0+",
 	"type": "parserhook",
 	"requires": {
 		"MediaWiki": ">= 1.25.0"