diff --git a/Plugins,-Tools-and-Hardware.md b/Plugins,-Tools-and-Hardware.md
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--- a/Plugins,-Tools-and-Hardware.md
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@@ -182,6 +182,8 @@ This plugin sets your vertical 0 index as your main deck. Whenever you change yo
 
 [CopyCode](https://github.com/Martinomagnifico/reveal.js-copycode): A simple plugin that automatically shows a 'copy' button in code blocks. ([Demo](https://martinomagnifico.github.io/reveal.js-copycode/demo.html))
 
+[ExternalCode](https://github.com/dafrenchyman/reveal.js-extrernal-code): A simple plugin that lets you use code from external files in code blocks. ([Demo](https://teaching.mrsharky.com/sdsu_fall_2020_lecture02.html#/7/5/0), assuming I don't change the slides.)
+
 [Internation](https://github.com/Martinomagnifico/reveal.js-internation): A basic internationalization (i18n) or localization (i10n) plugin that lets the user choose a language for the presentation. Internation will also help you generate the JSON file that you start translating from. ([Demo](https://martinomagnifico.github.io/reveal.js-internation/demo.html))
 
 [Poll](https://github.com/jschildgen/reveal.js-poll-plugin): A plugin to add an interactive poll to reveal.js slides. The quiz question and answers is shown on the slides, the audience can vote via their mobile phone, and the result is shown on the presentation slides as a bar chart.