diff --git a/doc/Debug.md b/doc/Debug.md
index 25b66be..40d91c2 100644
--- a/doc/Debug.md
+++ b/doc/Debug.md
@@ -83,7 +83,7 @@ struct Foo {
 The field `bar` will be displayed with `path::to::my_fmt_fn(&bar, &mut fmt)`
 where `fmt` is the current [`Formatter`].
 
-The function must the following prototype:
+The function must have the following prototype:
 
 ```rust,ignore
 fn fmt(&T, &mut std::fmt::Formatter) -> Result<(), std::fmt::Error>;
@@ -150,4 +150,4 @@ struct Foo {
     #[derivative(Debug="ignore")]
     bar: String,
 }
-```
\ No newline at end of file
+```