diff --git a/webapi/src/test/scala/org/knora/webapi/responders/ActorToZioBridgeMock.scala b/webapi/src/test/scala/org/knora/webapi/responders/ActorToZioBridgeMock.scala
index 6c5223f3e3..acc62a9011 100644
--- a/webapi/src/test/scala/org/knora/webapi/responders/ActorToZioBridgeMock.scala
+++ b/webapi/src/test/scala/org/knora/webapi/responders/ActorToZioBridgeMock.scala
@@ -7,11 +7,16 @@ import zio.ZLayer
 import zio.mock
 import zio.mock.Mock
 import zio.mock.Proxy
-
 import scala.reflect.ClassTag
 
 import org.knora.webapi.messages.ResponderRequest
 
+/**
+ * zio-mock implementation for the [[ActorToZioBridge]]
+ *
+ * See also the zio-mock documentation:
+ * [[https://zio.dev/ecosystem/officials/zio-mock/#encoding-polymorphic-capabilities]]
+ */
 object ActorToZioBridgeMock extends Mock[ActorToZioBridge] {
   object AskAppActor extends Poly.Effect.Output[ResponderRequest, Throwable]