diff --git a/Browser-Support.md b/Browser-Support.md
index 34e129a..2580c4d 100644
--- a/Browser-Support.md
+++ b/Browser-Support.md
@@ -1,17 +1,16 @@
-Currently, reveal.js has four tiers of browser support: 
+Currently, reveal.js has five tiers of browser support: 
 
 1. 3D Transforms version
 2. 2D UI with only linear and page animations
 3. 2D UI with no animation
 4. 2D UI showing all slides in a vertical row
+5. Absolutely no support - either nothing shown onscreen or screen contents mangled/disfigured
 (Ignoring ESC key support as it would complicate things)
 
-1st tier: __Chrome__, __Safari__, __Firefox__, and __IE10__. 
-
-2nd tier: __Opera__ and __Maxthon__. 
-
-3rd tier: __IE9__.
-
-4th tier: __IE8__, the Kindle Fire Silk Browser 1.0 and __Maxthon Mobile__. 
+1st tier: __Chrome__, __Safari__, __Firefox__, and __IE10__.  
+2nd tier: __Opera__ and __Maxthon__.  
+3rd tier: __IE9__, __Firefox 3.6__.  
+4th tier: __IE8__, the __Kindle Fire Silk Browser 1.0__ and __Maxthon Mobile__.   
+5th tier: __IE7 and lower__, __all non-JavaScript browsers__.  
 
 (When no version # is specified, the current version, the previous version, and the next version are supported)
\ No newline at end of file