diff --git a/README.md b/README.md
index dbe56616..b0146e48 100644
--- a/README.md
+++ b/README.md
@@ -120,7 +120,10 @@ The following selectors are not implemented yet:
   will not grab CSS files referenced in <link> elements (the problem email clients are going to ignore these tags
   anyway, so why leave them in your HTML?).
 * Even with styles inline, certain CSS properties are ignored by certain email clients. For more information,
-  review documentation [here](http://www.email-standards.org/).
+  refer to these resources:
+    * [http://www.email-standards.org/](http://www.email-standards.org/)
+    * [https://www.campaignmonitor.com/css/](https://www.campaignmonitor.com/css/)
+    * [http://templates.mailchimp.com/resources/email-client-css-support/](http://templates.mailchimp.com/resources/email-client-css-support/)
 * All CSS attributes that apply to a node will be applied, even if they are redundant. For example, if you define a
   font attribute _and_ a font-size attribute, both attributes will be applied to that node (in other words, the more
   specific attribute will not be combined into the more general attribute).
@@ -144,6 +147,19 @@ Those that wish to contribute bug fixes, new features, refactorings and clean-up
 When you contribute, please take the following things into account:
 
 * Please cover all changes with unit tests and make sure that your code does not break any existing tests.
+* To run the existing PHPUnit tests, run the following 
+  command:
+  
+      composer install
+  
+  and then run this command:
+  
+      vendor/bin/phpunit Tests/
+  
+  If you want to uninstall the development packages that were installed when 
+  you ran `composer install`, you can run this command:
+  
+      composer install --no-dev
 * Please use the same coding style (PSR-2) as the rest of the code. Indentation is four spaces.
 * Please make your code clean, well-readable and easy to understand.
 * If you add new methods or fields, please use proper PHPDoc for the new methods/fields.