diff --git a/proto/frequenz/api/common/v1alpha8/microgrid/electrical_components/electrical_components.proto b/proto/frequenz/api/common/v1alpha8/microgrid/electrical_components/electrical_components.proto
index 3509039c..287ce345 100644
--- a/proto/frequenz/api/common/v1alpha8/microgrid/electrical_components/electrical_components.proto
+++ b/proto/frequenz/api/common/v1alpha8/microgrid/electrical_components/electrical_components.proto
@@ -685,9 +685,14 @@ message ElectricalComponent {
 //     (https://en.wikipedia.org/wiki/Passive_sign_convention).
 //
 // !!! info "Historical Data"
-//     The timestamps of when a connection was created and terminated allows for
-//     tracking the changes over time to a microgrid, providing insights into
-//     when and how the microgrid infrastructure has been modified.
+//     The timestamps of when a connection was created and terminated allows for
+//     tracking the changes over time to a microgrid, providing insights into
+//     when and how the microgrid infrastructure has been modified.
+//
+// !!! info "No Self-Connections"
+//     `source_electrical_component_id` MUST NOT equal
+//     `destination_electrical_component_id`. A component cannot be connected
+//     to itself.
 //
 message ElectricalComponentConnection {
   // Unique identifier of the component where the connection originates. This is