diff --git a/src/footnotes.ts b/src/footnotes.ts
index 4a00f08..e2fd952 100644
--- a/src/footnotes.ts
+++ b/src/footnotes.ts
@@ -23,7 +23,7 @@ export function footnote_ref_ext(renderer: marked.Renderer, opts: MarkdownOption
 		level: 'inline',
 		start: (src) => src.match(/\[\^/)?.index,
 		tokenizer(src, tokens) {
-			const rule = /^\[\^([a-zA-Z0-9-._§]+)]/;
+			const rule = /^\[\^([a-zA-Z0-9-\._, §]+)]/;
 			const match = rule.exec(src);
 
 			if (match) {
@@ -68,7 +68,7 @@ export function footnote_list_ext(renderer: marked.Renderer, opts: MarkdownOptio
 			};
 
 			let remaining = src;
-			const prefix_rule = /^\[\^([a-zA-Z0-9\._§-]+)]:/;
+			const prefix_rule = /^\[\^([a-zA-Z0-9\., _§-]+)]:/;
 			const whitespace_rule = /^\s*(?:\n|$)/;
 
 			if (! prefix_rule.test(src)) {