diff --git a/src/Potter/Renderable/AbstractRenderable.php b/src/Potter/Renderable/AbstractRenderable.php
index edbe2eb..046d1ab 100644
--- a/src/Potter/Renderable/AbstractRenderable.php
+++ b/src/Potter/Renderable/AbstractRenderable.php
@@ -6,5 +6,5 @@ namespace Potter\Renderable;
 
 abstract class AbstractRenderable implements RenderableInterface
 {
-
+    abstract public function render(): string;
 }
diff --git a/src/Potter/Renderable/RenderableInterface.php b/src/Potter/Renderable/RenderableInterface.php
index 51ee59d..cb324cd 100644
--- a/src/Potter/Renderable/RenderableInterface.php
+++ b/src/Potter/Renderable/RenderableInterface.php
@@ -6,5 +6,5 @@ namespace Potter\Renderable;
 
 interface RenderableInterface 
 {
-
+     public function render(): string;
 }
diff --git a/src/Potter/Renderable/RenderableTrait.php b/src/Potter/Renderable/RenderableTrait.php
index e63955c..41e4854 100644
--- a/src/Potter/Renderable/RenderableTrait.php
+++ b/src/Potter/Renderable/RenderableTrait.php
@@ -6,5 +6,5 @@ namespace Potter\Renderable;
 
 trait RenderableTrait 
 {
-
+    abstract public function render(): string;
 }