Update README.md

README.md

@@ -61,6 +61,7 @@ If you don't have root access, remove the `sudo` part and instead  use  `--user`
 
 **Common Problems:**
  * If you get an error that `Could not find SATe tools bundle directory:`, it means you don't have the right tools directory at the right location. Maybe you downloaded MAC instead of Linux? Or, maybe you didn't put the directory in the parent directory of where pasta code is? Most likely, you used the zip files and forgot to remove teh `-master` from the directory name. Run `mv sate-tools-mac-master sate-tools-mac` on MAC or `mv sate-tools-linux-master sate-tools-linux` to fix this issue. 
+ * The `setup.py` script is supposed to install setuptools for you if you don't have it. This sometimes works and sometimes doesn't. If you get and error with a message like ` invalid command 'develop'`, it means that setuptools is not installed. To solve this issue, you can manually install [setup tools](https://pypi.python.org/pypi/setuptools#installation-instructions). For example, on Linux, you can run: `curl https://bootstrap.pypa.io/ez_setup.py -o - | sudo python` (but note there are other ways of installing setuptools as well).
 
 
 Email `pasta-users@googlegroups.com` for installation issues.