diff --git a/src/types/ContentType.ts b/src/types/ContentType.ts
index e93e911..9c79520 100644
--- a/src/types/ContentType.ts
+++ b/src/types/ContentType.ts
@@ -2,11 +2,11 @@ import React from 'react'
 
 type RenderContentType = {
   renderContent: (read: boolean) => React.ReactNode
-  readonly contentComponent: undefined
+  readonly contentComponent?: React.ReactNode
 }
 
 type ContentComponentType = {
-  renderContent: undefined
+  renderContent?: (read: boolean) => React.ReactNode
   readonly contentComponent: React.ReactNode
 }
 
diff --git a/src/types/HeaderType.ts b/src/types/HeaderType.ts
index 6901f6f..d0ee3a8 100644
--- a/src/types/HeaderType.ts
+++ b/src/types/HeaderType.ts
@@ -2,11 +2,11 @@ import React from 'react'
 
 type RenderHeaderType = {
   renderHeader: (read: boolean) => React.ReactNode
-  readonly headerComponent: undefined
+  readonly headerComponent?: React.ReactNode
 }
 
 type HeaderComponentType = {
-  renderHeader: undefined
+  renderHeader?: (read: boolean) => React.ReactNode
   readonly headerComponent: React.ReactNode
 }