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-rw-r--r--docs/ref/migrate/nng1.md6
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diff --git a/docs/ref/migrate/nng1.md b/docs/ref/migrate/nng1.md
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--- a/docs/ref/migrate/nng1.md
+++ b/docs/ref/migrate/nng1.md
@@ -54,6 +54,12 @@ Likewise, when using the streams API, use the [`nng_stream_listener_set_tls`] or
Note that the declarations needed for TLS configuration are now available in `<nng/nng.h>`,
rather than the supplemental header.
+## Old TLS Versions Removed
+
+Support for very old TLS versions 1.0 and 1.1 is removed.
+Further, the `NNG_TLS_1_0` and `NNG_TLS_1_1` constants are also removed.
+Applications should use `NNG_TLS_1_2` or even `NNG_TLS_1_3` instead.
+
## Option Functions
The previously deprecated `nng_pipe_getopt_xxx` family of functions is removed.