issue #56: install warning for Ubuntu/Debian folks

README.md

@@ -40,7 +40,15 @@ See <http://trentm.com/json> for full docs and many examples.
 You should now have "json" on your PATH:
 
     $ json --version
-    json 3.1.2
+    json 6.0.0
+
+
+**WARNING for Ubuntu/Debian users:** There is a current bug in Debian stable
+such that "apt-get install nodejs" installed a `nodejs` binary instead of a
+`node` binary. You'll either need to create a symlink for `node`, change the
+`json` command's shebang line to "#!/usr/bin/env nodejs" or use
+[chrislea's PPA](https://launchpad.net/~chris-lea/+archive/node.js/) as
+discussed on [issue #56](https://github.com/trentm/json/issues/56).
 
 
 # Test suite