Builtins.md

@@ -76,4 +76,12 @@ 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.
+`touint64` will parse any string to an unsigned integer, skipping preceding whitespace and stopping at any non-digit.
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+
+## free
+
+```
+void free(uint8* memory);
+```
+
+Functions exactly as the C equivalent.
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