diff --git a/shared/naturalcrit/markdown.js b/shared/naturalcrit/markdown.js
index 7185cab8e..7dbc32f1a 100644
--- a/shared/naturalcrit/markdown.js
+++ b/shared/naturalcrit/markdown.js
@@ -234,6 +234,15 @@ const superSubScripts = {
 	}
 };
 
+const underline = {
+	name  : 'underline',
+	level : 'inline',
+	start(src) { return src.match(/\w_[^_]_/m)?.index;},
+	tokenizer(src, tokens) {
+		const uRegex = /^_(?!\s)(?=([^_]*[^\s]))\1\^/m;
+	}
+}
+
 const definitionLists = {
 	name  : 'definitionLists',
 	level : 'block',