diff --git a/readme.md b/readme.md
index ebad54a1..b31fbcc3 100644
--- a/readme.md
+++ b/readme.md
@@ -149,7 +149,7 @@ Returns a [`Response` object](https://developer.mozilla.org/en-US/docs/Web/API/R
 
 Sets `options.method` to the method name and makes a request.
 
-When using a `Request` instance as `input`, any URL altering options (such as `prefixUrl`) will be ignored.
+When using a [`Request`](https://developer.mozilla.org/en-US/docs/Web/API/Request) instance as `input`, any URL altering options (such as `prefixUrl`) will be ignored.
 
 #### options