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-This section documents supplemental TLS functions that are available.
+This section documents supplemental TLS (Transport Layer Security)
+functions that are available.
+TLS support is available when using Scalability Protocols with
+the <<nng_tls.7#,TLS>> transport, or when using WebSocket, either
+with the <<nng_ws.7#,WebSocket>> transport for Scalability Protocols,
+or combined with other HTTP capabilities.
+
+These functions depend on library support that is not included directly
+with _NNG_ however, so their presence will depend on whether this
+additional support was present and enabled with _libnng_ was built.
+
+Currently, this extra support can be provided by the
+https://tls.mbed.org[mbedTLS library].