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diff --git a/slides/intro/Container_Network_Model.md b/slides/intro/Container_Network_Model.md
index 851c8d33..8486e860 100644
--- a/slides/intro/Container_Network_Model.md
+++ b/slides/intro/Container_Network_Model.md
@@ -75,6 +75,8 @@ eb0eeab782f4        host                host
 
 ---
 
+class: extra-details
+
 ## Differences with the CNI
 
 * CNI = Container Network Interface
@@ -87,6 +89,22 @@ eb0eeab782f4        host                host
 
 ---
 
+class: pic
+
+## Single container in a Docker network
+
+![bridge0](images/bridge1.png)
+
+---
+
+class: pic
+
+## Two containers on two Docker networks
+
+![bridge3](images/bridge2.png)
+
+---
+
 ## Creating a network
 
 Let's create a network called `dev`.
@@ -284,7 +302,7 @@ since we wiped out the old Redis container).
 
 ---
 
-class: x-extra-details
+class: extra-details
 
 ## Names are *local* to each network
 
@@ -472,11 +490,13 @@ b2887adeb5578a01fd9c55c435cad56bbbe802350711d2743691f95743680b09
 
 * If containers span multiple hosts, we need an *overlay* network to connect them together.
 
-* Docker ships with a default network plugin, `overlay`, implementing an overlay network leveraging VXLAN.
+* Docker ships with a default network plugin, `overlay`, implementing an overlay network leveraging 
+  VXLAN, *enabled with Swarm Mode*.
 
 * Other plugins (Weave, Calico...) can provide overlay networks as well.
 
-* Once you have an overlay network, *all the features that we've used in this chapter work identically.*
+* Once you have an overlay network, *all the features that we've used in this chapter work identically 
+  across multiple hosts.*
 
 ---