diff --git a/2-ui/1-document/11-coordinates/article.md b/2-ui/1-document/11-coordinates/article.md
index a000ba37..939ba914 100644
--- a/2-ui/1-document/11-coordinates/article.md
+++ b/2-ui/1-document/11-coordinates/article.md
@@ -250,4 +250,4 @@ Any point on the page has coordinates:
 
 Window coordinates are great to use with `position:fixed`, and document coordinates do well with `position:absolute`.
 
-Both coordinate systems have their "pro" and "contra", there are times we need one or the other one, just like CSS `position` `absolute` and `fixed`.
+Both coordinate systems have their pros and cons; there are times we need one or the other one, just like CSS `position` `absolute` and `fixed`.