diff --git a/backend/src/config/index.ts b/backend/src/config/index.ts
index 158983d5c..caedac08e 100644
--- a/backend/src/config/index.ts
+++ b/backend/src/config/index.ts
@@ -70,9 +70,11 @@ const email = {
     process.env.EMAIL_LINK_VERIFICATION || 'http://localhost/checkEmail/{optin}{code}',
   EMAIL_LINK_SETPASSWORD:
     process.env.EMAIL_LINK_SETPASSWORD || 'http://localhost/reset-password/{optin}',
+  // time in minutes a optin code is valid
   EMAIL_CODE_VALID_TIME: process.env.EMAIL_CODE_VALID_TIME
     ? parseInt(process.env.EMAIL_CODE_VALID_TIME) || 1440
     : 1440,
+  // time in minutes that must pass to request a new optin code
   EMAIL_CODE_REQUEST_TIME: process.env.EMAIL_CODE_REQUEST_TIME
     ? parseInt(process.env.EMAIL_CODE_REQUEST_TIME) || 10
     : 10,