--- a/src/.env.tmpl	Thu Dec 06 01:35:30 2018 +0100
+++ b/src/.env.tmpl	Tue Dec 18 02:27:22 2018 +0100
@@ -42,8 +42,33 @@
 
 # expiration delta for JWT tokens (in seconds)
 # default: 3600
-# JWT_EXPIRATION_DELTA = 3600
+# JWT_EXPIRATION_DELTA=3600
 
 # expiration refresh delta for JWT tokens (in seconds)
 # default: 3600*24*7 = 604800
-# JWT_REFRESH_EXPIRATION_DELTA = 604800
+# JWT_REFRESH_EXPIRATION_DELTA=604800
+
+# email backend c.f. https://docs.djangoproject.com/en/2.1/topics/email/#obtaining-an-instance-of-an-email-backend
+# default: 'django.core.mail.backends.console.EmailBackend'
+# EMAIL_BACKEND=django.core.mail.backends.console.EmailBackend
+
+# email host
+# default: localhost
+# EMAIL_HOST=localhost
+
+# email port (integer)
+# default: 25
+# EMAIL_PORT=25
+
+# email host user
+# default: None
+# EMAIL_HOST_USER=
+
+# email host password
+# default: None
+# EMAIL_HOST_PASSWORD=
+
+# email use TLS
+# default: False
+# EMAIL_USE_TLS=False
+