README.md in html-proofer-0.7.0 vs README.md in html-proofer-0.7.1

@@ -17,9 +17,11 @@
     $ bundle
 
 Or install it yourself as:
 
     $ gem install html-proofer
+    
+**NOTE:** When installation speed matters, set `NOKOGIRI_USE_SYSTEM_LIBRARIES` to `true` in your environment. This is useful for increasing the speed of your Continuous Integration builds.
 
 ## Usage
 
 ### Using in a script