diff --git a/README.md b/README.md
index fede712..d9f9c09 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,8 @@ Matz's Ruby Interpreter, also called CRuby, is the most widely deployed version
 For a list of differences, see:
 http://stackoverflow.com/questions/21574/what-is-the-difference-between-ruby-1-8-and-ruby-1-9
 
+This binding supports RGSS1, RGSS2 and RGSS3.
+
 ### mruby (Lightweight Ruby)
 Website: https://github.com/mruby/mruby
 
@@ -29,6 +31,8 @@ Due to heavy differences between mruby and MRI as well as lacking modules, runni
 
 Some extensions to the standard classes/modules are provided, taking the RPG Maker XP helpfile as a quasi "reference". These include Marshal, File, FileTest and Time.
 
+This binding only supports RGSS1.
+
 **Important:** If you decide to use [mattn's oniguruma regexp gem](https://github.com/mattn/mruby-onig-regexp), don't forget to add `-lonig` to the linker flags to avoid ugly symbol overlaps with libc.
 
 ### null