diff --git a/plugins/NickAuth/plugin.py b/plugins/NickAuth/plugin.py
index 631423c52..d62d0d179 100644
--- a/plugins/NickAuth/plugin.py
+++ b/plugins/NickAuth/plugin.py
@@ -177,7 +177,11 @@ class NickAuth(callbacks.Plugin):
             ircdb.users.setUser(user, flush=False)
             irc.reply(_('You are now authenticated as %s.') % user.name)
         else:
-            irc.error(_('No user has this nick on this network.'))
+            irc.error(_('No user of claimed the nick %s on this network. '
+                        'If this is you, you should connect with an other '
+                        'method and use the "nickauth nick add" command, '
+                        'or ask the owner of the bot to do it.')
+                       % (theiraccount,))
 
     def doAccount(self, irc, msg):
         account = msg.args[0]