diff --git a/index.js b/index.js
index a9826e2..d7b570b 100644
--- a/index.js
+++ b/index.js
@@ -11,6 +11,7 @@ module.exports = (str, options) => {
   if (typeof str !== 'string') throw new TypeError('expected a string');
   return str.trim()
     .replace(/([a-z])([A-Z])/g, '$1-$2')
+    .replace(/(\d+)/g, m => options && options.splitOnDigits ? `-${m}-` : m)
     .replace(/\W/g, m => /[À-ž]/.test(m) ? m : '-')
     .replace(/^-+|-+$/g, '')
     .replace(/-{2,}/g, m => options && options.condense ? '-' : m)