diff --git a/docs/docs/docs/LibraryIntegrations.md b/docs/docs/docs/LibraryIntegrations.md
index 0f28798..ccefbcf 100644
--- a/docs/docs/docs/LibraryIntegrations.md
+++ b/docs/docs/docs/LibraryIntegrations.md
@@ -81,7 +81,7 @@ object MyTest extends SimpleIOSuite {
 Differ instances for cats data structures like `NonEmptyList` and `Chain` can be found in
 
 ```
-"com.github.jatcwang" %% "difflicious-scalatest" % "{{ site.version }}" % Test
+"com.github.jatcwang" %% "difflicious-cats" % "{{ site.version }}" % Test
 ```
 
 ```scala mdoc:nest
diff --git a/modules/cats/src/main/scala/difflicious/cats/CatsInstances.scala b/modules/cats/src/main/scala/difflicious/cats/CatsInstances.scala
index b474723..af0fd0a 100644
--- a/modules/cats/src/main/scala/difflicious/cats/CatsInstances.scala
+++ b/modules/cats/src/main/scala/difflicious/cats/CatsInstances.scala
@@ -100,6 +100,22 @@ trait CatsInstances {
     )
   }
 
+  implicit def chainDiffer[A](
+    implicit aDiffer: Differ[A],
+    typeName: TypeName[Chain[A]],
+  ): SeqDiffer[Chain, A] = {
+    SeqDiffer.create(
+      itemDiffer = aDiffer,
+      typeName = typeName.copy(
+        long = "cats.data.Chain",
+        short = "Chain",
+      ),
+      asSeq = chainAsSeq,
+    )
+  }
+
+  implicit def validatedDiffer[E: Differ, A: Differ]: Differ[Validated[E, A]] = Differ.derived
+
 }
 
 object CatsInstances extends CatsInstances