diff --git a/c-api/toy_memory_h.md b/c-api/toy_memory_h.md
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@@ -0,0 +1,67 @@
+# toy_memory.h
+
+This header defines all of the memory management utilities. Any and all heap-based memory management goes through these utilities.
+
+A default memory allocator function is used internally, but it can be overwritten for diagnostic and platform related purposes.
+
+## Defined Macros
+
+### TOY_GROW_CAPACITY(capacity)
+
+This macro calculates, in place, what size of memory should be allocated based on the previous size.
+
+### TOY_GROW_CAPACITY_FAST(capacity)
+
+This macro calculates, in place, what size of memory should be allocated based on the previous size. It grows faster than `TOY_GROW_CAPACITY`.
+
+### TOY_ALLOCATE(type, count)
+
+This macro wraps `Toy_reallocate`, which itself calls the allocator function. `type` is the type that will be allocated, and `count` is the number which will be needed (usually calculated with `TOY_GROW_CAPACITY`).
+
+This returns a pointer of `type`.
+
+### TOY_FREE(type, pointer)
+
+This macro wraps `Toy_reallocate`, which itself calls the allocator function. `type` is the type that will be freed, and `pointer` is to what is being freed. This should only be used when a single element has been allocated, as opposed to an array.
+
+### TOY_FREE_ARRAY(type, pointer, oldCount)
+
+This macro wraps `Toy_reallocate`, which itself calls the allocator function. `type` is the type that will be freed, `pointer` is a reference to what is being freed, and `oldCount` is the size of the array being freed. This should only be used when an array has been allocated, as opposed to a single element.
+
+### TOY_GROW_ARRAY(type, pointer, oldCount, count)
+
+This macro wraps `Toy_reallocate`, which itself calls the allocator function. `type` is the type that is being operated on, `pointer` is what is being resized, `oldCount` is the previous size of the array and `count` is the new size of the array (usually calculated with `TOY_GROW_CAPACITY`).
+
+This returns a pointer of `type`.
+
+### TOY_SHRINK_ARRAY(type, pointer, oldCount, count)
+
+This macro wraps `Toy_reallocate`, which itself calls the allocator function. `type` is the type that is being operated on, `pointer` is what is being resized, `oldCount` is the previous size of the array and `count` is the new size of the array.
+
+This returns a pointer of `type`.
+
+## Defined Interfaces
+
+### typedef void* (*Toy_MemoryAllocatorFn)(void* pointer, size_t oldSize, size_t newSize)
+
+This function interface is used for defining any memory allocator functions.
+
+Any and all memory allocator functions should:
+
+* Take a `pointer` to a previously allocated block of memory, or `NULL`
+* Take the `oldSize`, which is the previous size of the `pointer` allocated, in bytes (`oldSize` can be 0)
+* Take the `newSize`, which is the new size of the buffer to be allocaated, in bytes (`newSize` can be 0)
+* Return the newly allocated buffer, or `NULL` if `newSize` is zero
+* Return `NULL` on error
+
+## Defined Functions
+
+### TOY_API void* Toy_reallocate(void* pointer, size_t oldSize, size_t newSize)
+
+This function shouldn't be called directly. Instead, use one of the given macros.
+
+This function wraps a call to the internal assigned memory allocator.
+
+### void Toy_setMemoryAllocator(Toy_MemoryAllocatorFn)
+
+This function sets the memory allocator, replacing the default memory allocator.
diff --git a/index.md b/index.md
index 18aaf97..8c15365 100644
--- a/index.md
+++ b/index.md
@@ -69,7 +69,7 @@ print tally(); //3
 * [toy_literal_array.h]
 * [toy_literal_dictionary.h]
 * [toy_literal.h]
-* [toy_memory.h]
+* [toy_memory.h](c-api/toy_memory_h.md)
 * [toy_parser.h](c-api/toy_parser_h.md)
 * [toy_refstring.h]
 * [toy_scope.h]