Update README.md

Author: stevengj

README.md

@@ -35,8 +35,9 @@ private to Julia (not in your `PATH`).  (You can use `using IJulia` followed by
 `IJulia.jupyter` to find the location `jupyter` where was installed.)
 On Linux, it defaults to looking for `jupyter` in your `PATH` first,
 and only installs the Conda Jupyter if that fails; you can force
-it to use Conda on Linux by setting `ENV["JUPYTER"]=""` first (see below). In a Debian or Ubuntu 
-GNU/Linux system, install the package `jupyter-client`.
+it to use Conda on Linux by setting `ENV["JUPYTER"]=""` first (see below).
+(In a Debian or Ubuntu  GNU/Linux system, install the package `jupyter-client`
+first to use the system `jupyter`.)
 
 Alternatively, you can [install
 Jupyter](http://jupyter.readthedocs.org/en/latest/install.html) (or