Update README.md

Author: mikeckennedy

days/67-69-pyperclip/README.md

@@ -7,7 +7,7 @@ It's a wonderful tool for copying and pasting to the clipboard using your Python
 
 ## Day N: Pyperclip usage and an Affiliate script
 
-Get your environment setup and learn how to use Pyperclip with the setup and usage videos.
+Get your environment setup and learn how to use Pyperclip with the setup and usage videos. Note to **Linux** users: You likely need to install `xclip` to get `Pyperclip` to work on your system, [more info here](https://github.com/talkpython/100daysofcode-with-python-course/issues/46).
 
 Once done, move onto *Generate affiliate links with Pyperclip* to see a solid use case for Pyperclip (something we use ourselves!).
 
@@ -38,4 +38,4 @@ Be sure to share your last couple of days work on Twitter or Facebook. Use the h
 
 Here are [some examples](https://twitter.com/search?q=%23100DaysOfCode) to inspire you. Consider including [@talkpython](https://twitter.com/talkpython) and [@pybites](https://twitter.com/pybites) in your tweets.
 
-*See a mistake in these instructions? Please [submit a new issue](https://github.com/talkpython/100daysofcode-with-python-course/issues) or fix it and [submit a PR](https://github.com/talkpython/100daysofcode-with-python-course/pulls).*
+*See a mistake in these instructions? Please [submit a new issue](https://github.com/talkpython/100daysofcode-with-python-course/issues) or fix it and [submit a PR](https://github.com/talkpython/100daysofcode-with-python-course/pulls).*