Index: doc/invoke.texi
===================================================================
--- doc/invoke.texi	(revision 158042)
+++ doc/invoke.texi	(working copy)
@@ -425,8 +425,9 @@
 
 @item Directory Options
 @xref{Directory Options,,Options for Directory Search}.
-@gccoptlist{-B@var{prefix}  -I@var{dir}  -iquote@var{dir}  -L@var{dir}
--specs=@var{file}  -I- --sysroot=@var{dir}}
+@gccoptlist{-B@var{prefix} -I@var{dir} -iplugindir=@var{dir}}
+-iquote@var{dir} -L@var{dir} -specs=@var{file} -I-
+--sysroot=@var{dir}
 
 @item Target Options
 @c I wrote this xref this way to avoid overfull hbox. -- rms
@@ -8865,6 +8866,12 @@
 If you really need to change the search order for system directories,
 use the @option{-nostdinc} and/or @option{-isystem} options.
 
+@item -iplugindir=@var{dir}
+Set the directory to search for plugins which are passed
+by @option{-fplugin=@var{name}} instead of
+@option{-fplugin=@var{path}/@var{name}.so}.  This option is not meant
+to be used by the user, but only passed by the driver.
+
 @item -iquote@var{dir}
 @opindex iquote
 Add the directory @var{dir} to the head of the list of directories to