[README.md] Update pypi instructions

README.md

@@ -27,7 +27,13 @@ If you do not have curl, you can alternatively use a recent wget:
 
 Windows users can [download an .exe file](https://yt-dl.org/latest/youtube-dl.exe) and place it in any location on their [PATH](http://en.wikipedia.org/wiki/PATH_%28variable%29) except for `%SYSTEMROOT%\System32` (e.g. **do not** put in `C:\Windows\System32`).
 
-OS X users can install **youtube-dl** with [Homebrew](http://brew.sh/):
+You can also use pip:
+
+    sudo pip install --upgrade youtube-dl
+    
+This command will update youtube-dl if you have already installed it. See the [pypi page](https://pypi.python.org/pypi/youtube_dl) for more information.
+
+OS X users can install youtube-dl with [Homebrew](http://brew.sh/):
 
     brew install youtube-dl
 
@@ -35,10 +41,6 @@ Or with [MacPorts](https://www.macports.org/):
 
     sudo port install youtube-dl
 
-You can also use pip:
-
-    sudo pip install youtube-dl
-
 Alternatively, refer to the [developer instructions](#developer-instructions) for how to check out and work with the git repository. For further options, including PGP signatures, see the [youtube-dl Download Page](https://rg3.github.io/youtube-dl/download.html).
 
 # DESCRIPTION