+
+## Extending Heap Reservation ##
+
+By default, the stdlib uses the first 16 heap addresses. All heap access (other
+than heap[0] as a seed) occurs through `stackrotate` and `stackrotatereverse`.
+Edit these functions to increase the stdlib's heap reservation.
+
+The remainder of the stdlib is written to automatically use the new allocation.
+Functions like `printf`, for example, allow more substitutions when the heap
+allocation is increased.