diff --git a/admin/MAINTAINERS b/admin/MAINTAINERS
index dd339f9af80..41bc780d1cc 100644
--- a/admin/MAINTAINERS
+++ b/admin/MAINTAINERS
@@ -405,6 +405,11 @@ Spencer Baugh
 Yuan Fu
        lisp/progmodes/c-ts-mode.el
 
+Basil L. Contovounesios
+	lisp/battery.el (UPower support)
+	lisp/json.el
+	src/image.c (WebP support)
+
 ==============================================================================
 3. Externally maintained packages.
 ==============================================================================
diff --git a/etc/tutorials/TUTORIAL.translators b/etc/tutorials/TUTORIAL.translators
index 2b1444b13b8..bbae2809f2e 100644
--- a/etc/tutorials/TUTORIAL.translators
+++ b/etc/tutorials/TUTORIAL.translators
@@ -31,6 +31,7 @@ Maintainer: Rafael Sepúlveda <drs@gnulinux.org.mx>
 * TUTORIAL.el_GR:
 Author:     Protesilaos Stavrou <info@protesilaos.com>
 Maintainer: Protesilaos Stavrou <info@protesilaos.com>
+            Basil L. Contovounesios <basil@contovou.net>
 
 * TUTORIAL.fa:
 Author:     Mohsen BANAN <emacs@mohsen.1.banan.byname.net>