diff --git a/java/com/google/gerrit/server/mail/send/RegisterNewEmailSender.java b/java/com/google/gerrit/server/mail/send/RegisterNewEmailSender.java
index 91d8e81..1983ade 100644
--- a/java/com/google/gerrit/server/mail/send/RegisterNewEmailSender.java
+++ b/java/com/google/gerrit/server/mail/send/RegisterNewEmailSender.java
@@ -24,6 +24,10 @@
 import com.google.inject.Inject;
 import com.google.inject.assistedinject.Assisted;
 
+/**
+ * Sender that informs a user by email about the registration of a new email address for their
+ * account.
+ */
 public class RegisterNewEmailSender extends OutgoingEmail {
   public interface Factory {
     RegisterNewEmailSender create(String address);