diff --git a/src/builtins/README.md b/src/builtins/README.md
index 60d3209..b490526 100644
--- a/src/builtins/README.md
+++ b/src/builtins/README.md
@@ -1 +1,3 @@
-Here are implemented the language's builtin variables. Each file define it's values and exposes them through a `StaticMapSlot` array. These values can then be accessed from within the language by wrapping these arrays in static map objects (check src/o_staticmap.c to know more).
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+Here are implemented the language's builtin variables. Each file defines it's values and exposes them through an array of `StaticMapSlot`s. These values can then be accessed from within the language by wrapping these arrays in static map objects (check src/o_staticmap.c to know more).
+
+The array of `StaticMapSlot`s defined by `basic.c` is the root of the builtin object tree. All other arrays are referred by it.
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