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diff --git a/abi.md b/abi.md
index c2ff165..0dbbcc4 100644
--- a/abi.md
+++ b/abi.md
@@ -62,3 +62,8 @@ e.g.
 
 * param 0: pointer to the value of `x`
 * param 1: the value of`y`
+
+# inter-function and stack values
+
+ints, bools and closures are passed around within functions in `%rax`.
+adts are passed on the stack, at whatever stack index the code generation was called with.
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