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README.md

@@ -3,3 +3,8 @@
 `rlox` is an unpronouncable variant of the tree-walk interpreter laid out in
 [Crafting Interpreters](http://craftinginterpreters.com/), written in Ruby,
 because I want to learn it.
+
+It deviates a little from the “canonical” version of Lox. I don’t use code
+generation for the expressions, and I don’t use the visitor pattern. `var` and
+`fun` are `let` and `fn`, respectively. And we don’t need parentheses around
+branching conditions, instead we require the bodies to be blocks.