diff --git a/eleventy.config.js b/eleventy.config.js
index 169420f..4960ba6 100644
--- a/eleventy.config.js
+++ b/eleventy.config.js
@@ -91,6 +91,10 @@ export default async function (eleventyConfig) {
 		return arr.slice(0, arr.length - 1);
 	});
 
+	eleventyConfig.addFilter("abbr", (abbr, def) => {
+		return `<abbr title="${def}">${abbr}</abbr>`;
+	});
+
 	// Shortcodes
 
 	// Cowsay