diff --git a/Istio/README.md b/Istio/README.md
index 53d112f..2a475b8 100755
--- a/Istio/README.md
+++ b/Istio/README.md
@@ -34,3 +34,24 @@ Internal and external authentication should be set together.
 https://istio.io/latest/docs/ops/diagnostic-tools/proxy-cmd/
 
 
+## Services port names
+
+Istio allows to specify which protocol will run through a port.
+
+It requires the name of the port to be set to a specific format `name: <protocol>(-<suffix>)`.
+
+Starting from Kubernetes 1.18, it also can be specified through the `appProtocol` field in the port, resulting in `appProtocol: <protocol>`.
+
+This means that port names should respect this format to avoid issues, and for such be cautious when setting up  the name of the ports. 
+
+This applies to multiple Istio elements, but as well to `kind: Services` from default Kubernetes.
+
+For more information about this behavior, refer to:
+
+https://istio.io/latest/docs/ops/configuration/traffic-management/protocol-selection/#explicit-protocol-selection
+
+
+# Links of interest
+
+- https://istiobyexample.dev/
+