diff --git a/public/docs/ts/latest/guide/glossary.jade b/public/docs/ts/latest/guide/glossary.jade
index d9ed0552e5..2adc35c2e7 100644
--- a/public/docs/ts/latest/guide/glossary.jade
+++ b/public/docs/ts/latest/guide/glossary.jade
@@ -5,7 +5,7 @@
     p.
       <i>The difference between the right word
       and the almost right word is the difference between
-      lightening and a lightening bug.</i> - Mark Twain
+      lightning and a lightning bug.</i> - Mark Twain
 
 :markdown
   Angular 2 has a vocabulary of its own.