diff --git a/README.md b/README.md
index 2e12dfa..bce3930 100644
--- a/README.md
+++ b/README.md
@@ -118,7 +118,7 @@ var md = require('markdown-it')({
   quotes: '“”‘’',
 
   // Highlighter function. Should return escaped HTML,
-  // or '' if the source string is not changed and should be escaped externaly.
+  // or '' if the source string is not changed and should be escaped externally.
   // If result starts with <pre... internal wrapper is skipped.
   highlight: function (/*str, lang*/) { return ''; }
 });