diff --git a/LICENSE b/LICENSE
index f064c86..399c1be 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,7 @@
 MIT License
 
 Copyright (c) 2022 Michael
+Copyright (c) 2022 sup39
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/src/App.css b/src/App.css
index deb2626..619ce83 100644
--- a/src/App.css
+++ b/src/App.css
@@ -221,3 +221,11 @@ textarea {
   'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
   sans-serif;
 }
+
+p.License {
+  padding-left: 3em;
+  font-size: 0.75em;
+}
+p.License code {
+  white-space: pre;
+}
diff --git a/src/surfaces/License.ts b/src/surfaces/License.ts
new file mode 100644
index 0000000..22632a6
--- /dev/null
+++ b/src/surfaces/License.ts
@@ -0,0 +1,24 @@
+const text = `MIT License
+
+Copyright (c) 2022 Michael
+Copyright (c) 2022 sup39
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.`;
+
+export default text;
diff --git a/src/surfaces/OptionPage.tsx b/src/surfaces/OptionPage.tsx
index 622e1ad..d3eaa5f 100644
--- a/src/surfaces/OptionPage.tsx
+++ b/src/surfaces/OptionPage.tsx
@@ -1,6 +1,7 @@
 import { TitledList } from "components/TitledList";
 import { saveAs } from "data/FileSaver";
 import { useRef, useState } from "react";
+import license from "./License";
 
 type OptionPageProps = {
 	interlaceInventory: boolean,
@@ -115,6 +116,17 @@ export const OptionPage: React.FC<OptionPageProps> = ({
 						
 					</p>
 
+					<h3 className="Reference">Credits</h3>
+					<p className="Reference">
+						This app is a fork of <a href="https://github.com/iTNTPiston">iTNTPiston</a>'s <a href="https://dupl.itntpiston.app/">dupl.itntpiston.app</a>, and is modified by <a href="https://github.com/sup39">sup39</a>. This app is released under MIT license:
+					</p>
+					<p className="Reference License">
+						<code>{license}</code>
+					</p>
+					<p className="Reference">
+						The source code of this app can be found on <a href="https://github.com/sup39/botw-hundo-dupl">Github</a>.
+					</p>
+
 				</div>
 			</TitledList>
 		</div>