8 files changed, 26 insertions, 72 deletions
diff --git a/docs/man/libnng.3.adoc b/docs/man/libnng.3.adoc
index b787c7e8..5748546d 100644
--- a/docs/man/libnng.3.adoc
+++ b/docs/man/libnng.3.adoc
@@ -297,7 +297,7 @@ as a convenience to aid in creating portable applications.
 // |xref:nng_mtx_unlock.3supp.adoc[nng_mtx_unlock()]|unlock mutex
 |xref:nng_opts_parse.3supp.adoc[nng_opts_parse()]|parse command line options
 // |xref:nng_random.3supp.adoc[nng_random()]|get random number
-|xref:nng_socket_pair.3supp.adoc[nng_socket_pair()]|create connected pair of BSD sockets
+// |xref:nng_socket_pair.3supp.adoc[nng_socket_pair()]|create connected pair of BSD sockets
 |xref:nng_thread_create.3supp.adoc[nng_thread_create()]|create thread
 |xref:nng_thread_destroy.3supp.adoc[nng_thread_destroy()]|reap thread
 |xref:nng_thread_set_name.3supp.adoc[nng_thread_set_name()]|set thread name
diff --git a/docs/man/nng_socket_pair.3supp.adoc b/docs/man/nng_socket_pair.3supp.adoc
deleted file mode 100644
index 7718e27b..00000000
--- a/docs/man/nng_socket_pair.3supp.adoc
+++ /dev/null
@@ -1,52 +0,0 @@
-= nng_socket_pair(3supp)
-//
-// Copyright 2024 Staysail Systems, Inc. <info@staysail.tech>
-//
-// This document is supplied under the terms of the MIT License, a
-// copy of which should be located in the distribution where this
-// file was obtained (LICENSE.txt).  A copy of the license may also be
-// found online at https://opensource.org/licenses/MIT.
-//
-
-== NAME
-
-nng_socket_pair - create a connected pair of BSD sockets
-
-== SYNOPSIS
-
-[source, c]
-----
-#include <nng/nng.h>
-
-int nng_socket_pair(int fds[2]);
-----
-
-== DESCRIPTION
-
-The `nng_socket_pair()` function creates a pair of connected BSD sockets.
-These sockets, which are returned in the _fds_ array, are suitable for
-use with the xref:nng_socket.7.adoc[_socket_] transport.
-
-On POSIX platforms, this is a thin wrapper around the standard `socketpair()` function,
-using the `AF_UNIX` family and the `SOCK_STREAM` socket type.
-
-NOTE: At present only POSIX platforms implementing `socketpair()` are supported with this function.
-
-TIP: This function may be useful for creating a shared connection between a parent process and
-a child process on UNIX platforms, without requiring a shared filesystem or TCP connection.
-
-== RETURN VALUES
-
-This function returns 0 on success, and non-zero otherwise.
-
-== ERRORS
-
-[horizontal]
-`NNG_ENOMEM`:: Insufficient memory exists.
-`NNG_ENOTSUP`:: This platform does not support socket pairs.
-
-== SEE ALSO
-
-[.text-left]
-xref:nng_socket.7.adoc[nng_socket(7)],
-xref:nng.7.adoc[nng(7)]
diff --git a/docs/ref/SUMMARY.md b/docs/ref/SUMMARY.md
index 1d7065c2..c68fb2b3 100644
--- a/docs/ref/SUMMARY.md
+++ b/docs/ref/SUMMARY.md
@@ -1,8 +1,8 @@
 # Summary
 
-- [API](./api.md)
+- [API](./api/index.md)
 
-  - [Threading Functions](./api/thr/index.md)
+  - [Threading and Synchronization](./api/thr/index.md)
 
     - [nng_cv](./api/thr/nng_cv.md)
     - [nng_mtx](./api/thr/nng_mtx.md)
@@ -14,6 +14,7 @@
     - [nng_id_map](./api/util/nng_id_map.md)
     - [nng_msleep](./api/util/nng_msleep.md)
     - [nng_random](./api/util/nng_random.md)
+    - [nng_socket_pair](./api/util/nng_socket_pair.md)
     - [nng_strdup](./api/util/nng_strdup.md)
     - [nng_strerror](./api/util/nng_strerror.md)
     - [nng_version](./api/util/nng_version.md)
diff --git a/docs/ref/api.md b/docs/ref/api.md
deleted file mode 100644
index 84d0501f..00000000
--- a/docs/ref/api.md
+++ /dev/null
@@ -1,4 +0,0 @@
-# API
-
-- [Threading Support](api/thr/)
-- [Utility Functions](api/util/)
diff --git a/docs/ref/api/index.md b/docs/ref/api/index.md
new file mode 100644
index 00000000..6ad8257f
--- /dev/null
+++ b/docs/ref/api/index.md
@@ -0,0 +1,4 @@
+# API
+
+- [Threading and Synchronization](api/thr/)
+- [Utility Functions](api/util/)
diff --git a/docs/ref/api/thr/index.md b/docs/ref/api/thr/index.md
index 6355cfef..bdd8bef4 100644
--- a/docs/ref/api/thr/index.md
+++ b/docs/ref/api/thr/index.md
@@ -1,4 +1,8 @@
-# Threading Functions
+# Threading and Synchronization
+
+These interfaces are likely to be useful when implementing concurrent designs.
+Furthermore, because NNG itself is based on concurrency, the synchronization primitives
+are likely to be useful in callback functions and similar situations.
 
 - [nng_cv](nng_cv.md)
 - [nng_mtx](nng_mtx.md)
diff --git a/docs/ref/api/util/index.md b/docs/ref/api/util/index.md
index 1f202c0f..cc6ee7e2 100644
--- a/docs/ref/api/util/index.md
+++ b/docs/ref/api/util/index.md
@@ -2,14 +2,15 @@
 
 This section documents various utility functions that may help
 with application portability. These are not fundamental to NNG
-or Scalability Protocols, but we find them useful for a variety
+or Scalability Protocols, but they are likely 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)
-- [nng_random](nng_random.md)
-- [nng_strdup](nng_strdup.md)
-- [nng_strerror](nng_strerror.md)
-- [nng_version](nng_version.md)
+- [nng_alloc](nng_alloc.md) --- allocate memory
+- [nng_clock](nng_clock.md) --- get time
+- [nng_id_map](nng_id_map.md) --- identifier based mapping table
+- [nng_msleep](nng_msleep.md) --- sleep milliseconds
+- [nng_random](nng_random.md) --- get random number
+- [nng_socket_pair](nng_socket_pair.md) --- create a connected pair of BSD sockets
+- [nng_strdup](nng_strdup.md) --- duplicate string
+- [nng_strerror](nng_strerror.md) --- return an error description
+- [nng_version](nng_version.md) --- report library version
diff --git a/docs/ref/tran/socket.md b/docs/ref/tran/socket.md
index 0b7d5a45..c55966a8 100644
--- a/docs/ref/tran/socket.md
+++ b/docs/ref/tran/socket.md
@@ -4,10 +4,10 @@
 
 The {{i:_socket_ transport}} supports communication between
 peers across arbitrary BSD sockets, such as those that are
-created with [`nng_socket_pair()`][nng_socket_pair].
+created with [`nng_socket_pair`][nng_socket_pair].
 
 This transport only supports [listeners][listener],
-using [`nng_listener_create()`][nng_listener_create].
+using [`nng_listener_create`][nng_listener_create].
 
 > [!NOTE]
 > Attempts to create [dialers][dialer] using this transport will result in `NNG_ENOTSUP`.
@@ -63,7 +63,7 @@ Additionally, the following options may be supported on pipes when the platform
 [dialer]: [TODO.md]
 [nng_sockaddr]: [TODO.md]
 [nng_listener_create]: [TODO.md]
-[nng_socket_pair]: [TODO.md]
+[nng_socket_pair]: ../../api/util/nng_socket_pair.md
 [NNG_OPT_LOCADDR]: [TODO.md]
 [NNG_OPT_REMADDR]: [TODO.md]
 [NNG_OPT_URL]: [TODO.md]