diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index f24c22f70166..b65a21fc86b7 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,9 @@
+2011-01-08  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/46405
+	* invoke.texi:  Mention -ffree-line-length-none and
+	-ffixed-line-length-none for preprocessing.
+
 2011-01-08  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/46896
diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi
index 3dcdbcc9763e..913132120492 100644
--- a/gcc/fortran/invoke.texi
+++ b/gcc/fortran/invoke.texi
@@ -394,9 +394,11 @@ this option to manually enable preprocessing of any kind of Fortran file.
 To disable preprocessing of files with any of the above listed extensions,
 use the negative form: @option{-nocpp}.
 
-The preprocessor is run in traditional mode, be aware that any
-restrictions of the file-format, e.g. fixed-form line width,
-apply for preprocessed output as well.
+The preprocessor is run in traditional mode. Any restrictions of the
+file-format, especially the limits on line length, apply for
+preprocessed output as well, so it might be advisable to use the
+@option{-ffree-line-length-none} or @option{-ffixed-line-length-none}
+options.
 
 @item -dM
 @opindex @code{dM}