Add some more details to the manual.

manual.scrbl

@@ -10,13 +10,16 @@
 
 This library provides an incomplete typed interface to the
 @hyperlink["https://docs.racket-lang.org/graph/index.html"]{generic graph
-library}.
+library}.  The following parts are @bold{not currently covered}:
 
-As the name says it, the graph library relies on Racket generics quite
-a bit, which are not supported by Typed Racket as of 2021-10-10.
-Furthermore, the graph library defines a number of cool and elegant
-macros, which I haven't figured out how to get working with Typed
-Racket yet.
+@itemlist[
+@item{generic graph interface,}
+@item{generic queues (from the package @racket[gen-queue-lib]),}
+@item{macros.}
+]
+
+I may work on adding these in the future, but it is low priority for me as of
+2021-12-21.  Feel free to contribute!
 
 @bold{TODO:} List the exported functions together with their types.
 
@@ -32,7 +35,9 @@ As of 2021, GitHub is owned by Microsoft, so I prefer keeping this library on
 a different platform.
 
 Do feel free to submit patches to me by E-mail: I will try my best to review
-and apply them within a reasonable time frame.
+and apply them within a reasonable time frame.  More details on contributing in
+the
+@hyperlink["https://git.marvid.fr/scolobb/typed-graph/src/branch/master/README.md#submitting-patches"]{README}.
 
 @section{Technical details}