diff --git a/README.md b/README.md
index ed2ec1f..224a934 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ Valid expansions are:
 // {a,b,...}
 ```
 
-A comma seperated list of options, like `{a,b}` or `{a,{b,c}}` or `{,a,}`.
+A comma separated list of options, like `{a,b}` or `{a,{b,c}}` or `{,a,}`.
 
 ```js
 /^-?\d+\.\.-?\d+(\.\.-?\d+)?$/