diff --git a/Yep/ViewControllers/Profile/ProfileViewController.swift b/Yep/ViewControllers/Profile/ProfileViewController.swift
index 6b03c2d9..d8a82466 100644
--- a/Yep/ViewControllers/Profile/ProfileViewController.swift
+++ b/Yep/ViewControllers/Profile/ProfileViewController.swift
@@ -506,7 +506,7 @@ class ProfileViewController: UIViewController {
 
                 if username.isEmpty {
 
-                    YepAlert.textInput(title: NSLocalizedString("Create a username", comment: ""), message: NSLocalizedString("In order to share your profile, create a unique username first.", comment: ""), placeholder: "letters", oldText: nil, confirmTitle: NSLocalizedString("Create", comment: ""), cancelTitle: NSLocalizedString("Cancel", comment: ""), inViewController: self, withConfirmAction: { text in
+                    YepAlert.textInput(title: NSLocalizedString("Create a username", comment: ""), message: NSLocalizedString("In order to share your profile, create a unique username first.", comment: ""), placeholder: NSLocalizedString("use letters, numbers, and underscore", comment: ""), oldText: nil, confirmTitle: NSLocalizedString("Create", comment: ""), cancelTitle: NSLocalizedString("Cancel", comment: ""), inViewController: self, withConfirmAction: { text in
 
                         let newUsername = text