2 files changed, 48 insertions, 0 deletions
diff --git a/docs/ref/api/util/index.md b/docs/ref/api/util/index.md
index 0a96da44..24c88d9c 100644
--- a/docs/ref/api/util/index.md
+++ b/docs/ref/api/util/index.md
@@ -5,6 +5,7 @@ with application portability. These are not fundamental to NNG
 or Scalability Protocols, but we find them useful for a variety
 of other uses.
 
+- [nng_alloc](nng_alloc.md)
 - [nng_clock](nng_clock.md)
 - [nng_id_map](nng_id_map.md)
 - [nng_msleep](nng_msleep.md)
diff --git a/docs/ref/api/util/nng_alloc.md b/docs/ref/api/util/nng_alloc.md
new file mode 100644
index 00000000..39b7bc2c
--- /dev/null
+++ b/docs/ref/api/util/nng_alloc.md
@@ -0,0 +1,47 @@
+# nng_alloc
+
+## NAME
+
+nng_alloc --- allocate memory
+
+## SYNOPSIS
+
+```c
+#include <nng/nng.h>
+
+void *nng_alloc(size_t size);
+void nng_free(void *ptr, size_t size);
+```
+
+## DESCRIPTION
+
+The {{i:`nng_alloc`}} function allocates a contiguous memory region of
+at least _size_ bytes.
+The memory will be 64-bit aligned.
+
+The {{i:`nng_free`}} function deallocates {{i:memory}} previously allocated by `nng_alloc`.
+
+Memory returned by `nng_alloc` can be used to hold message buffers, in which
+case it can be directly passed to [`nng_send`][nng_send] using the flag `NNG_FLAG_ALLOC`.
+Alternatively, it can be freed when no longer needed using `nng_free`.
+
+> [!IMPORTANT]
+> Do not use the system `free` function (or the C++ `delete` operator) to release this memory.
+> On some configurations this may work, but on others it will lead to a crash or
+> other unpredictable behavior.
+
+## RETURN VALUES
+
+The `nng_alloc` function returns a pointer to the allocated memory on success,
+and `NULL` otherwise.
+
+## ERRORS
+
+No errors are returned, but if memory cannot be allocated then `NULL` is returned.
+This can reasonably be treated as if an `NNG_ENOMEM` error occurred.
+
+## SEE ALSO
+
+[nng_send][nng_send]
+
+[nng_send]: [TODO.md]