--- gcc/cpp.texinfo	2018/04/24 16:51:55	1.1.1.6
+++ gcc/cpp.texinfo	2018/04/24 16:52:50	1.1.1.7
@@ -301,12 +301,12 @@ however, contain a @samp{<} character.
 
 @item #include "@var{file}"
 This variant is used for header files of your own program.  It
-searches for a file named @var{file} first in the current
-directory, then in the same directories used for system header
-files.  The current directory is tried first because it is
-presumed to be the location of the files of the program being
-compiled.  (If the @samp{-I-} option is used, the special treatment
-of the current directory is inhibited.)
+searches for a file named @var{file} first in the current directory,
+then in the same directories used for system header files.  The
+current directory is the directory of the current input file.  It is
+tried first because it is presumed to be the location of the files
+that the current input file refers to.  (If the @samp{-I-} option is
+used, the special treatment of the current directory is inhibited.)
 
 The argument @var{file} may not contain @samp{"} characters.  If
 backslashes occur within @var{file}, they are considered ordinary text
@@ -2025,13 +2025,18 @@ Source file name and line number informa
 the form
 
 @example
-# @var{linenum} @var{filename}
+# @var{linenum} @var{filename} @var{flag}
 @end example
 
 @noindent
-which are inserted as needed into the middle of the input (but never within
-a string or character constant).  Such a line means that the following line
-originated in file @var{filename} at line @var{linenum}.
+which are inserted as needed into the middle of the input (but never
+within a string or character constant).  Such a line means that the
+following line originated in file @var{filename} at line @var{linenum}.
+
+The third field, @var{flag}, may be a number, or may be absent.  It is
+@samp{1} for the beginning of a new source file, and @samp{2} for return
+to an old source file at the end of an included file.  It is absent
+otherwise.
 
 @node Invocation,, Output, Top
 @section Invoking the C Preprocessor