diff --git a/index.js b/index.js
index 164055b..90a2032 100644
--- a/index.js
+++ b/index.js
@@ -1,6 +1,5 @@
 /**
  * Render Govspeak markup.
- *
  * @param {object} [options] Options for the extension
  * @returns {object} A MarkedExtension to be passed to `marked.use()`
  */
diff --git a/lib/block-tokenizer.js b/lib/block-tokenizer.js
index dd34780..1698913 100644
--- a/lib/block-tokenizer.js
+++ b/lib/block-tokenizer.js
@@ -5,7 +5,7 @@
  * @param {string} name Extension name, i.e. `govspeak-example`
  * @param {string} open Opening tag, i.e. $E
  * @param {string} [close] Closing tag, i.e. $E
- * @returns {object} Tokens
+ * @returns {object|undefined} Tokens
  */
 module.exports = function (lexer, src, name, open, close) {
   if (!src.startsWith(`${open}\n`)) {