diff --git a/README.md b/README.md
index a325a85..e8122ad 100644
--- a/README.md
+++ b/README.md
@@ -564,7 +564,9 @@ For instance, take into account the snaptshot above. If you already know how to
         * [How Encryption Works @ AWS](https://www.youtube.com/watch?v=plv7PQZICCM) 📼 🆓
         * [KMS](https://aws.amazon.com/kms/)
           * [Encryption and Key Management @ AWS](https://www.youtube.com/watch?v=uhXalpNzPU4) 📼 🆓
-
+    * Certificates
+      * Service Name Indication
+        * [What is SNI?](https://www.youtube.com/watch?v=manTiXESYG0) 📼 🆓
     * Monitoring
       * Data Leaks
         * [Amazon Macie](https://www.youtube.com/watch?v=8piwEQJJXdo) 📼 🆓
diff --git a/resources/topic-graph.mmd b/resources/topic-graph.mmd
index 2e8bc04..9211d81 100644
--- a/resources/topic-graph.mmd
+++ b/resources/topic-graph.mmd
@@ -148,3 +148,4 @@ graph TD
       FIR --> WAF[Web Application Firewall]
     SEC --> ENC[Encryption]
     SEC --> SECMON[Monitoring]
+    SEC --> CERT[Certificates]
diff --git a/resources/topic-graph.png b/resources/topic-graph.png
index c15c2a0..0b6de6d 100644
Binary files a/resources/topic-graph.png and b/resources/topic-graph.png differ