--- a/gcc/ada/libgnat/a-locale.ads	Thu Oct 25 07:37:49 2018 +0900
+++ b/gcc/ada/libgnat/a-locale.ads	Thu Feb 13 11:34:05 2020 +0900
@@ -6,7 +6,7 @@
 --                                                                          --
 --                                 S p e c                                  --
 --                                                                          --
---          Copyright (C) 2010-2018, Free Software Foundation, Inc.         --
+--          Copyright (C) 2010-2019, Free Software Foundation, Inc.         --
 --                                                                          --
 -- This specification is derived from the Ada Reference Manual for use with --
 -- GNAT.  In accordance with the copyright of that document, you can freely --
@@ -19,18 +19,34 @@
    pragma Preelaborate (Locales);
    pragma Remote_Types (Locales);
 
+   --  A locale identifies a geopolitical place or region and its associated
+   --  language, which can be used to determine other internationalization-
+   --  related characteristics. The active locale is the locale associated with
+   --  the partition of the current task.
+
    type Language_Code is new String (1 .. 3)
       with Dynamic_Predicate =>
          (for all E of Language_Code => E in 'a' .. 'z');
+   --  Lower-case string representation of an ISO 639-3 alpha-3 code that
+   --  identifies a language.
 
    type Country_Code is new String (1 .. 2)
       with Dynamic_Predicate =>
          (for all E of Country_Code => E in 'A' .. 'Z');
+   --  Upper-case string representation of an ISO 3166-1 alpha-2 code that
+   --  identifies a country.
 
    Language_Unknown : constant Language_Code := "und";
    Country_Unknown  : constant Country_Code := "ZZ";
 
    function Language return Language_Code;
+   --  Returns the code of the language associated with the active locale. If
+   --  the Language_Code associated with the active locale cannot be determined
+   --  from the environment, then Language returns Language_Unknown.
+
    function Country return Country_Code;
+   --  Returns the code of the country associated with the active locale. If
+   --  the Country_Code associated with the active locale cannot be determined
+   --  from the environment, then Country returns Country_Unknown.
 
 end Ada.Locales;