diff --git a/pluralize.js b/pluralize.js
index 1829fc8..68e0382 100644
--- a/pluralize.js
+++ b/pluralize.js
@@ -437,6 +437,7 @@
     'hardware',
     'headquarters',
     'health',
+    'hertz',
     'herpes',
     'highjinks',
     'homework',