better wording in Config

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/Config.in b/Config.in
index b4ea702..e7bb05d 100644
--- a/Config.in
+++ b/Config.in
@@ -161,9 +161,11 @@
 
 	  The idea is that many valid printable Unicode chars are
 	  nevertheless are not displayed correctly. Think about
-	  combining charachers, double-wide hieroglyphs and such.
-	  Many terminals, xterms and such will fail to handle them
-	  correctly.
+	  combining charachers, double-wide hieroglyphs, obscure
+	  characters in dozens of ancient scripts...
+	  Many terminals, terminal emulators, xterms etc will fail
+	  to handle them correctly. Choose the smallest value
+	  which suits your needs.
 
 	  Typical values are:
 	  126 - ASCII only
@@ -172,6 +174,10 @@
 			code is ~700 bytes smaller for this case.
 	  4351 (0x10ff) - there are no double-wide chars in [0..4351] range,
 			code is ~300 bytes smaller for this case.
+	  12799 (0x31ff) - nearly all non-ideographic characters are
+			available in [0..12799] range, including
+			East Asian scripts like katakana, hiragana, hangul,
+			bopomofo...
 	  0 - off, any valid printable Unicode character will be printed.
 
 config UNICODE_COMBINING_WCHARS