diff --git a/java/com/google/gerrit/server/mail/send/AddKeySender.java b/java/com/google/gerrit/server/mail/send/AddKeySender.java
index 8b3d3f7..5d3960e 100644
--- a/java/com/google/gerrit/server/mail/send/AddKeySender.java
+++ b/java/com/google/gerrit/server/mail/send/AddKeySender.java
@@ -24,6 +24,7 @@
 import com.google.inject.assistedinject.AssistedInject;
 import java.util.List;
 
+/** Sender that informs a user by email about the addition of an SSH or GPG key to their account. */
 public class AddKeySender extends OutgoingEmail {
   public interface Factory {
     AddKeySender create(IdentifiedUser user, AccountSshKey sshKey);