diff --git a/README.md b/README.md
index 93c202b..5acb686 100644
--- a/README.md
+++ b/README.md
@@ -93,6 +93,9 @@ UPDATE_CHECK=true
 PFP=true
 # Language of the interface, options listed in `languages` directory
 LANGUAGE=en-US
+# Password to enter guest mode,
+# e.g. https://wishes.example.com?pw=ReplaceWithYourGuestPassword
+# GUEST_PASSWORD=ReplaceWithYourGuestPassword
 
 ## Wishlist Settings
 # Set to true to not allow users to have their own lists. You may want this for a birthday or wedding.
@@ -144,4 +147,4 @@ As of writing, there are no code contributors to the main project. However, ther
 * Czech: [drSchaps](https://github.com/drSchaps)
 * German: [PeteS4](https://github.com/PeteS4)
 * French: [zethis](https://github.com/zethis)
-* Spanish: [CantisW](https://github.com/CantisW)
\ No newline at end of file
+* Spanish: [CantisW](https://github.com/CantisW)
diff --git a/src/config/index.js b/src/config/index.js
index 1ee79e9..ef5a267 100644
--- a/src/config/index.js
+++ b/src/config/index.js
@@ -25,3 +25,7 @@ module.exports = {
 }
 
 if (module.exports.guestPassword) module.exports.wishlist.public = false
+if (module.exports.guestPassword === 'ReplaceWithYourGuestPassword') {
+  console.error('Error: Guest password should be changed from default.')
+  process.exit(1)
+}
\ No newline at end of file