diff --git a/web/react/components/signup_team_complete.jsx b/web/react/components/signup_team_complete.jsx
index 066161a101..b038679e6c 100644
--- a/web/react/components/signup_team_complete.jsx
+++ b/web/react/components/signup_team_complete.jsx
@@ -467,7 +467,8 @@ UsernamePage = React.createClass({
                 </div>
                 { name_error }
                 </div>
-                <p>{"Pick something " + strings.Team + "mates will recognize. Your username is how you will appear to others"}</p>
+                <p>{"Pick something " + strings.Team + "mates will recognize. Your username is how you will appear to others."}</p>
+                <p>It can be made of lowercase letters and numbers.</p>
                 <button className="btn btn-default" onClick={this.submitBack}><i className="glyphicon glyphicon-chevron-left"></i> Back</button>&nbsp;
                 <button className="btn-primary btn" onClick={this.submitNext}>Next<i className="glyphicon glyphicon-chevron-right"></i></button>
             </div>
diff --git a/web/react/components/signup_user_complete.jsx b/web/react/components/signup_user_complete.jsx
index 0fcdc92b0b..146419cf55 100644
--- a/web/react/components/signup_user_complete.jsx
+++ b/web/react/components/signup_user_complete.jsx
@@ -120,6 +120,7 @@ module.exports = React.createClass({
                 <img className="signup-team-logo" src="/static/images/logo.png" />
                 <h4>Welcome to { config.SiteName }</h4>
                 <p>{"Choose your username and password for the " + this.props.team_name + " " + strings.Team +"."}</p>
+                <p>Your username can be made of lowercase letters and numbers.</p>
                 <label className="control-label">Username</label>
                 <div className={ name_error ? "form-group has-error" : "form-group" }>
                 <input type="text" ref="name" className="form-control" placeholder="" maxLength="128" />