add :aliases advice (ref gh-54)

README.markdown

@@ -113,13 +113,23 @@ A more comprehensive configuration example can be found
 [here](https://github.com/lynaghk/cljx/blob/master/sample.project.clj).
 
 If you want cljx to be invoked automatically as part of the Leiningen
-compilation process (e.g. before testing, or cutting a jar), add cljx to your
-`:prep-tasks` vector in `project.clj`:
+compilation process (e.g. before cutting a jar, performing a release), add cljx
+to your `:prep-tasks` vector in `project.clj`:
 
 ```clojure
 :prep-tasks [["cljx" "once"]]
 ```
 
+Note that any Clojure tests generated by cljx will not be picked up by
+Leiningen's test runner (see
+[this](https://github.com/technomancy/leiningen/issues/1782) for some
+background). In general, it is probably advisable to set up aliases so you can
+completely control what Leiningen will run:
+
+```clojure
+:aliases {"cleantest" ["do" "clean," "cljx" "once," "test," "cljsbuild" "test"]}
+```
+
 ## Changelog
 
 See `CHANGES.md` at the root of this repo.