Builtins.md

@@ -77,3 +77,11 @@ int64 touint64(int8* num);
 `tostring` will take any primitive type and convert it to a string.
 `toint64` will parse any string to a signed integer, skipping preceding whitespace and stopping at any non-digit.
 `touint64` will parse any string to an unsigned integer, skipping preceding whitespace and stopping at any non-digit.
+
+## free
+
+```
+void free(uint8* memory);
+```
+
+Functions exactly as the C equivalent.
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