Add links to alternatives in README

README.md

@@ -1,20 +1,27 @@
 # go-gitdiff
 
 A Go library for parsing and applying patches generated by `git diff`, `git
-show`, and `git format-patch`.
+show`, and `git format-patch`. It can also parse and apply unified diffs
+generated by the standard `diff` tool.
 
-## Why another diff parser?
+## Why another git/unified diff parser?
 
-Several libraries with similar functionality already exist, so why make
-another?
+[Several][sourcegraph] [packages][sergi] with [similar][waigani]
+[functionality][seletskiy] exist, so why did I write another?
 
 1. No other libraries I found support binary diffs, as generated with the
-   `--binary` flag. This is the main reason for writing a new library.
+   `--binary` flag. This is the main reason for writing a new library, as the
+   format is pretty different from line-oriented diffs and is unique to Git.
 
-2. Most other libraries only parse patches, so you need something else to apply
+2. Most other packages only parse patches, so you need another package to apply
    them (and if they do support applies, it is only for text files.)
 
-3. The goal is to eventually accept anything that `git apply` accepts, based on
-   the code in [`apply.c`](https://github.com/git/git/blob/master/apply.c).
+3. This package aims to accept anything that `git apply` accepts, and closely
+   follows the logic in [`apply.c`](https://github.com/git/git/blob/master/apply.c).
 
-4. It seemed like a fun thing to write.
+4. It seemed like a fun thing to write and a good way to learn more about Git.
+
+[sourcegraph]: https://github.com/sourcegraph/go-diff
+[sergi]: https://github.com/sergi/go-diff
+[waigani]: https://github.com/waigani/diffparser
+[seletskiy]: https://github.com/seletskiy/godiff