diff --git a/basics/introduction.md b/basics/introduction.md
index b857665..940952a 100644
--- a/basics/introduction.md
+++ b/basics/introduction.md
@@ -54,7 +54,7 @@ You can read more about each type of tag in their respective sections.
 
 ## Filters
 
-**Filters** change the output of a Liquid object. They are using within an output and are separated by a `|`.
+**Filters** change the output of a Liquid object. They are used within an output and are separated by a `|`.
 
 <p class="code-label">Input</p>
 ```liquid