diff --git a/README.md b/README.md
index e4a267b..3d28ba7 100644
--- a/README.md
+++ b/README.md
@@ -417,7 +417,9 @@ For instance, take into account the snaptshot above. If you already know how to
           * HTTP/S
             * Certificate Authorization
             * SSL-TLS
-              * [How TLS (1.2) Handshake work - Computerfile](https://www.youtube.com/watch?v=86cQJ0MMses) 📼🆓
+              * [How TLS (1.2) Handshake work - Computerfile](https://www.youtube.com/watch?v=86cQJ0MMses) 📼 🆓
+          * MQTT
+            * [Intro to Message Queue Telemetry Transport](https://www.youtube.com/watch?v=eS4nx6tLSLs) 📼 🆓
       * Edge
         * CDN
         * "Global Accelerator"
diff --git a/resources/topic-graph.mmd b/resources/topic-graph.mmd
index 0e2fe2c..8901c52 100644
--- a/resources/topic-graph.mmd
+++ b/resources/topic-graph.mmd
@@ -123,7 +123,6 @@ graph TD
         SecM --> Vlt[Vaul]
       IaC --> SessM[Session Management]
         SessM --> Bdry[Boundary]
-
     OPS --> NET[Networking]
       NET --> NETP[Protocols]
         NETP --> DNS
@@ -133,6 +132,8 @@ graph TD
           TCP --> SSH
           TCP --> HTTP
           TCP --> SSL[TLS-SSL]
+            SSL --> mTLS[mTLS]
+          TCP --> MQTT[MQTT]
       NET --> NETE[Edge]
         NETE --> CDN
         NETE --> GAL[Global Accelerator]
diff --git a/resources/topic-graph.png b/resources/topic-graph.png
index ae4afa2..940a6ff 100644
Binary files a/resources/topic-graph.png and b/resources/topic-graph.png differ