diff --git a/Readme.md b/Readme.md
index e3607db..1ef8ad2 100644
--- a/Readme.md
+++ b/Readme.md
@@ -91,7 +91,7 @@ setInterval(function(){
 #### Web Inspector Colors
 
   Colors are also enabled on "Web Inspectors" that understand the `%c` formatting
-  option. These are WebKit web inspectors, and the Firebug plugin for Firefox.
+  option. These are WebKit web inspectors, Firefox since version 31 and the Firebug plugin for Firefox.
   Colored output looks something like:
 
   ![](https://cloud.githubusercontent.com/assets/71256/3139768/b98c5fd8-e8ef-11e3-862a-f7253b6f47c6.png)