diff --git a/docs/src/main/asciidoc/kafka.adoc b/docs/src/main/asciidoc/kafka.adoc
index 7a774e6e6c5e1..bd309385934a4 100644
--- a/docs/src/main/asciidoc/kafka.adoc
+++ b/docs/src/main/asciidoc/kafka.adoc
@@ -916,7 +916,12 @@ Type: _string_ | true |
 
 Type: _int_ | false | `1`
 
-| *group.id* | A unique string that identifies the consumer group the application belongs to. If not set, a unique, generated id is used
+| *group.id* | A unique string that identifies the consumer group the application belongs to.
+
+If not set, defaults to the application name as set by the `quarkus.application.name` configuration property.
+
+If that is not set either, a unique, generated id is used.
+It is recommended to always define a `group.id`, the automatic generation is only a convenient feature for development.
 
 Type: _string_ | false |