Updated README.

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 scheme.forth.jl
 ---------------
 
-A hobby scheme interpreter for FORTH 83. Specifically it is targeted at 
-[forth.jl](http://github.com/tgvaughan/forth.jl) which is an implementation
-of FORTH on top of [Julia](http://www.julialang.org), hence the name.
-At the moment it is a fairly direct port of Peter Micheaux's [Bootstrap
+A hobby scheme interpreter for FORTH 83. Specifically it is targeted at
+[forth.jl](http://github.com/tgvaughan/forth.jl) which is an implementation of
+FORTH on top of [Julia](http://www.julialang.org), hence the name.  It began
+life as a fairly direct port of Peter Micheaux's [Bootstrap
 Scheme](https://github.com/petermichaux/bootstrap-scheme) (as described in
-[this wonderful series of blog posts](http://peter.michaux.ca/articles/scheme-from-scratch-introduction))
-from C to forth, but I plan to go a bit beyond this by implementing some
-nice features like garbage collection, macros and a more complete numerical
-tower to bring it closer to [R5RS](http://www.schemers.org/Documents/Standards/R5RS/).
+[this wonderful series of blog
+posts](http://peter.michaux.ca/articles/scheme-from-scratch-introduction)) from
+C to forth.  In addition, this interpreter has a mark-sweep garbage collector.
+In future, I plan to also implement a macro system, file io, and a more
+complete numerical tower to bring it closer to
+[R5RS](http://www.schemers.org/Documents/Standards/R5RS/).
+
+The goal is for the interpreter to be complete enough to be used to complete
+the majority of the exercises found in [SICP](http://sarabander.github.io/sicp/).
 
 This software is free (as in freedom) and is distributed under the terms
 of version 3 of the GNU General Public License.  A copy of this license