diff --git a/src/news_gui.cpp b/src/news_gui.cpp
--- a/src/news_gui.cpp
+++ b/src/news_gui.cpp
@@ -1392,6 +1392,9 @@ static const WindowDesc _message_options
 	_nested_message_options_widgets, lengthof(_nested_message_options_widgets)
 );
 
+/**
+ * Show the settings window for news messages.
+ */
 void ShowMessageOptions()
 {
 	DeleteWindowById(WC_GAME_OPTIONS, 0);