diff --git a/guide/english/css/background-size/index.md b/guide/english/css/background-size/index.md
index ce776c2994..406a71a8f5 100644
--- a/guide/english/css/background-size/index.md
+++ b/guide/english/css/background-size/index.md
@@ -20,7 +20,7 @@ The background-size property specifies the size of the background images. You ca
 Note: If using pixel or percentage for length and you only specify one value, 
 the second one will be set to auto by default.
 
-To set this property on multiple background images separate values by comma:
+To set this property on multiple background images, separate the values by a comma:
 ```css
 .multiple {
     background-image: url(1.png), url(2.png);