diff --git a/README.md b/README.md
index add5d8c..307551a 100644
--- a/README.md
+++ b/README.md
@@ -271,6 +271,11 @@ At the moment this is not useful for anyone but myself, if at some point I find
     * Infrastructure as Code
       * [What is IaC?](https://www.youtube.com/watch?v=RO7VcUAsf-I) 📼 🆓
       * [Getting Started with IaC](https://www.youtube.com/watch?v=G3D14I5_NIk) 📼 🆓
+      * Containers
+        * [Docker](https://www.docker.com)
+          * Testing
+            * [goss/dgoss](https://github.com/aelsabbahy/goss) - Test docker images ⭐️
+              * [marceloboeira/kurz](https://github.com/marceloboeira/kurz) - Example setup ✍🏻
       * Orchestration
         * Kubernetes
           * Internals
diff --git a/TODO b/TODO
index c2ff00b..f677ff8 100644
--- a/TODO
+++ b/TODO
@@ -25,6 +25,7 @@ https://www.youtube.com/watch?v=aZjYr87r1b8
 https://github.com/zowens/commitlog/blob/master/src/file_set.rs#L17-L98
 Distributed Systems
 - Raft
+  - https://www.youtube.com/watch?time_continue=5&v=Hm_m4MIXn9Q
 - Paxos
 
 https://www.amazon.de/Designing-Distributed-Systems-Patterns-Paradigms/dp/1491983647/ref=pd_rhf_dp_s_pd_crcd_0_7/257-9514931-3061115?_encoding=UTF8&pd_rd_i=1491983647&pd_rd_r=1815f6be-471d-4f48-b420-f0399955883d&pd_rd_w=9aqLb&pd_rd_wg=oxfmN&pf_rd_p=7538ba11-5fe0-47c6-a94f-8715960a4f1d&pf_rd_r=5Z9WWAJ2DD72JDKND0FD&psc=1&refRID=5Z9WWAJ2DD72JDKND0FD
diff --git a/resources/topic-graph.mmd b/resources/topic-graph.mmd
index 1b68fe6..5145817 100644
--- a/resources/topic-graph.mmd
+++ b/resources/topic-graph.mmd
@@ -86,6 +86,8 @@ graph TD
           Netw --> airmon
           Netw --> airodump
     OPS --> IaC[Infrastructure as Code]
+      IaC --> Cont[Containers]
+        Cont --> Docker
       IaC --> CfgMgt[Configuration Management]
         CfgMgt --> Puppet
         CfgMgt --> Ansible
diff --git a/resources/topic-graph.png b/resources/topic-graph.png
index 20eb079..90ce7f4 100644
Binary files a/resources/topic-graph.png and b/resources/topic-graph.png differ