diff --git a/index.html b/index.html
index 3803455..292f860 100644
--- a/index.html
+++ b/index.html
@@ -60,6 +60,13 @@ available towards the bottom.</p>
 </div>
 <br>
 <br>
+<details>
+  <summary>Cheatsheet</summary>
+  <a href="https://upload.wikimedia.org/wikipedia/commons/1/19/Morse-code-tree.svg" target="blank_">
+  <img src="morse-code_files/International_Morse_Code.svg" alt="Alphabetical list of letters and their corresponding Morse Code representation">
+  </a>
+  <a href="https://en.wikipedia.org/wiki/File:International_Morse_Code.svg">Source</a>
+</details>
 <details>
   <summary>How to play the listening game</summary>
   <br>