diff --git a/README.md b/README.md
index 83eb55f..288e331 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,10 @@ This SDK allows a web developer to quickly add Duo's interactive, self-service,
 - 3.10
 - 3.11
 
+## TLS 1.2 and 1.3 Support
+
+Duo_client_python uses Python's ssl module and OpenSSL for TLS operations. Python versions 2.7 (and higher) and 3.5 (and higher) have both TLS 1.2 and TLS 1.3 support.
+
 ## What's here:
 * `duo_universal` - The Python Duo SDK for interacting with the Duo Universal Prompt
 * `demo` - An example web application with Duo integrated