show the most important compiled-in features on startup screen

CONFIG.md

@@ -223,11 +223,17 @@ Select startup banner - either a simple one, or with some colorful elements. `CO
 
 Richer banners need more BASIC segment, varies between brands.
 
+### `CONFIG_SHOW_FEATURES`
+
+If enabled, shows the most important compiled-in features on the startup screen.
+
+It is recommended to keep it enabled for informational purposes.
+
 ### `CONFIG_BANNER_PAL_NTSC`
 
 If enabled, prints video system on startup banner. Eye candy only.
 
-Feature needs some bytes in BASIC (depending on banner type) and about 25 bytes in KERNAL segment.
+Feature needs few bytes in BASIC and about 25 bytes in KERNAL segment.
 
 ## Debug options