Update README.md

Heydon · Feb 24, 2017 · 0b77a9c · 0b77a9c
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@@ -73,7 +73,7 @@ Don't worry, flexbox will make sure there aren't any gaps.
 
 ### Percentage widths
 
-You can choose a percentage based width for individual items, but remember to adjust for the gutter margin with by subtracting it using `calc`. For example, to make the first item 100% in width when the gutter width is `1em`, use:
+You can choose a percentage based width for individual items, but remember to adjust for the gutter margin width by subtracting it using `calc`. For example, to make the first item 100% in width when the gutter width is `1em`, use:
 
 ```css
 .fukol-grid > *:first-child {