diff --git a/src/doc/new-doc/developer-guide/contributing.txi b/src/doc/new-doc/developer-guide/contributing.txi
index 7aea2f4c3..50bb23bf9 100644
--- a/src/doc/new-doc/developer-guide/contributing.txi
+++ b/src/doc/new-doc/developer-guide/contributing.txi
@@ -21,6 +21,12 @@ For the purpose of this manual we maintain a few indexes:
 
 @verb{|@cindex User extensible streams|}
 
+@item Configure option index – options available in configure script
+
+Mark the default option with capital letters:
+
+@verb{$--enable-clos-streams [YES|builtin|no]$}
+
 @item Feature index – description of an item in @code{*FEATURES*}
 
 @verb{|@ftindex GRAY-STREAMS|}
@@ -87,3 +93,12 @@ Side effects listed
 For instance: if the user has some privigiles on the system
 @end defun
 @end verbatim
+
+@subsubsection Typed functions
+
+@verbatim
+@deftypefun return-type name (type arg)*
+description
+@end deftypefun
+
+@end verbatim
diff --git a/src/doc/new-doc/extensions/ffi.txi b/src/doc/new-doc/extensions/ffi.txi
index 1bbc3f4ea..78052b23a 100644
--- a/src/doc/new-doc/extensions/ffi.txi
+++ b/src/doc/new-doc/extensions/ffi.txi
@@ -68,6 +68,9 @@ user may directly invoked.
 @c @item Library FFI (LFFI)
 
 @item Dynamic FFI (DFFI)
+@cfindex --with-libffi-prefix=path
+@cfindex --with-dffi [system|included|AUTO|no]
+
 First of all, the foreign libraries are loaded in memory using the
 facilities of the operating system. Similar routines are used to find
 out and register the memory location of all the functions and variables
diff --git a/src/doc/new-doc/indexes/index.txi b/src/doc/new-doc/indexes/index.txi
index 9baa7865e..5e13d814a 100644
--- a/src/doc/new-doc/indexes/index.txi
+++ b/src/doc/new-doc/indexes/index.txi
@@ -3,6 +3,7 @@
 
 @menu
 * Concept index::
+* Configure option index::
 * Feature index::
 * Example index::
 * Function index::
@@ -16,6 +17,10 @@
 @section Concept index
 @printindex cp
 
+@node Configure option index
+@section Configure option index
+@printindex cf
+
 @node Feature index
 @section Feature index
 @printindex ft
diff --git a/src/doc/new-doc/new-doc.txi b/src/doc/new-doc/new-doc.txi
index eb256d982..0d8ae4fba 100644
--- a/src/doc/new-doc/new-doc.txi
+++ b/src/doc/new-doc/new-doc.txi
@@ -6,6 +6,7 @@
 @paragraphindent none
 @defcodeindex cpp
 @defcodeindex lsp
+@defcodeindex cf
 @defcodeindex ft
 @defindex ex
 @c %**end of header