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+= nng_tls_engine(5)
+//
+// Copyright 2020 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_tls_engine - TLS engine implementation
+
+== SYNOPSIS
+
+[source, c]
+----
+#include <nng/supplemental/tls/tls.h>
+#include <nng/supplemental/tls/engine.h>
+
+typedef struct nng_tls_engine_s nng_tls_engine;
+----
+
+== DESCRIPTION
+
+The ((TLS engine)) API is provided for developers wishing to implement their
+own implementation of TLS, or to adapt a 3rd party TLS implementation to
+the work with NNG.
+
+Information about the existing TLS engine can be obtained from the functions
+xref:nng_tls_engine_name.3tls.adoc[`nng_tls_engine_name()`],
+xref:nng_tls_engine_description.3tls.adoc[`nng_tls_engine_description()`], and
+xref:nng_tls_engine_fips_mode.3tls.adoc[`nng_tls_engine_fips_mode()`] functions.
+
+At this time, there is no further documentation on implementing a TLS
+engine oneself, but existing source code may be a guide.
+The primary interfaces are located in the
+`<nng/supplemental/tls/engine.h>` header file.
+
+== SEE ALSO
+
+[.text-left]
+
+xref:nng_tls_engine_description.3tls.adoc[nng_tls_engine_description(3tls)],
+xref:nng_tls_engine_fips_mode.3tls.adoc[nng_tls_engine_fips_mode(3tls)],
+xref:nng_tls_engine_name.3tls.adoc[nng_tls_engine_name(3tls)],
+xref:nng_tls_config.5.adoc[nng_tls_config(5)],
+xref:nng.7.adoc[nng(7)]