--- a/README.md	Mon Jan 22 22:23:01 2018 +0000
+++ b/README.md	Tue Jan 23 10:44:50 2018 +0000
@@ -10,6 +10,7 @@
 You will need to install the following non-standard Python packages:
 
  - [keyring](https://pypi.python.org/pypi/keyring) to extract passphrases from the keychain
+ - [pyyaml](http://pyyaml.org/) for parse configuration files
 
 The use the tray icon on Mac OS, you will need: