--- a/gcc/doc/cppopts.texi	Thu Oct 25 07:37:49 2018 +0900
+++ b/gcc/doc/cppopts.texi	Thu Feb 13 11:34:05 2020 +0900
@@ -1,4 +1,4 @@
-@c Copyright (C) 1999-2018 Free Software Foundation, Inc.
+@c Copyright (C) 1999-2020 Free Software Foundation, Inc.
 @c This is part of the CPP and GCC manuals.
 @c For copying conditions, see the file gcc.texi.
 
@@ -254,13 +254,18 @@
 
 @item -fextended-identifiers
 @opindex fextended-identifiers
-Accept universal character names in identifiers.  This option is
-enabled by default for C99 (and later C standard versions) and C++.
+Accept universal character names and extended characters in
+identifiers.  This option is enabled by default for C99 (and later C
+standard versions) and C++.
 
 @item -fno-canonical-system-headers
 @opindex fno-canonical-system-headers
 When preprocessing, do not shorten system header paths with canonicalization.
 
+@item -fmax-include-depth=@var{depth}
+@opindex fmax-include-depth
+Set the maximum depth of the nested #include. The default is 200. 
+
 @item -ftabstop=@var{width}
 @opindex ftabstop
 Set the distance between tab stops.  This helps the preprocessor report