Index: binaries/data/mods/public/gui/lobby/LobbyPage/Chat/ChatCommandHandler.js
===================================================================
--- binaries/data/mods/public/gui/lobby/LobbyPage/Chat/ChatCommandHandler.js
+++ binaries/data/mods/public/gui/lobby/LobbyPage/Chat/ChatCommandHandler.js
@@ -29,7 +29,7 @@
 			this.chatMessagesPanel.addText(
 				Date.now() / 1000,
 				this.systemMessageFormat.format(
-					sprintf(translate("The command '%(cmd)s' is not supported."), {
+					sprintf(translate("The command '%(cmd)s' is not supported. Type /help to get more information about the supported commands."), {
 						"cmd": setStringTags(escapeText(command), this.ChatCommandTags)
 					})));
 			this.chatMessagesPanel.flushMessages();