diff --git a/src/main/kotlin/fr/dcproject/entity/Comment.kt b/src/main/kotlin/fr/dcproject/entity/Comment.kt
index 7661790..cbcb059 100644
--- a/src/main/kotlin/fr/dcproject/entity/Comment.kt
+++ b/src/main/kotlin/fr/dcproject/entity/Comment.kt
@@ -38,4 +38,4 @@ open class Comment<T : TargetI>(
 
 open class CommentRef(id: UUID = UUID.randomUUID()) : CommentS(id)
 
-sealed class CommentS(id: UUID) : UuidEntity(id)
+sealed class CommentS(id: UUID) : TargetRef(id)
diff --git a/src/main/kotlin/fr/dcproject/entity/Extra.kt b/src/main/kotlin/fr/dcproject/entity/Extra.kt
index 5d32250..17b8bea 100644
--- a/src/main/kotlin/fr/dcproject/entity/Extra.kt
+++ b/src/main/kotlin/fr/dcproject/entity/Extra.kt
@@ -42,9 +42,7 @@ interface TargetI : UuidEntityI {
         fun getReference(t: TargetI): String {
             val ref = this.getReference(t::class)
             return if (t is ExtraI<*>) {
-                ref +
-                        "_on_" +
-                        t.target.reference
+                "${ref}_on_${t.target.reference}"
             } else {
                 ref
             }
diff --git a/src/main/kotlin/fr/dcproject/repository/Comment.kt b/src/main/kotlin/fr/dcproject/repository/Comment.kt
index 532ce46..89a3547 100644
--- a/src/main/kotlin/fr/dcproject/repository/Comment.kt
+++ b/src/main/kotlin/fr/dcproject/repository/Comment.kt
@@ -104,6 +104,20 @@ class CommentGeneric(requester: Requester) : Comment<TargetRef>(requester) {
                 )
         }
     }
+
+    override fun findByParent(
+        parentId: UUID,
+        page: Int,
+        limit: Int
+    ): Paginated<CommentEntity<TargetRef>> {
+        return requester.run {
+            getFunction("find_comments_by_parent")
+                .select(
+                    page, limit,
+                    "parent_id" to parentId
+                )
+        }
+    }
 }
 
 class CommentArticle(requester: Requester) : Comment<ArticleRef>(requester) {
diff --git a/src/test/resources/feature/comment.feature b/src/test/resources/feature/comment.feature
new file mode 100644
index 0000000..77d607d
--- /dev/null
+++ b/src/test/resources/feature/comment.feature
@@ -0,0 +1,7 @@
+Feature: comment
+
+  Scenario: Can comment childrens
+    Given I am authenticated as John Doe with id "64b7b379-2298-43ec-b428-ba134930cabd"
+    And I have article with id "9226c1a3-8091-c3fa-7d0d-c2e98c9bee7b"
+    When I send a GET request to "/comments/9226c1a3-8091-c3fa-7d0d-c2e98c9bee7b/children"
+    Then the response status code should be 200
\ No newline at end of file