typo

diff --git a/src/doc/reference.md b/src/doc/reference.md
index a43fca7c19d6f4f57a79d970acba6e2ffddd6e4f..1b8525dde8cc5c0e8df4e8bc014cf568769cf733 100644 (file)
--- a/src/doc/reference.md
+++ b/src/doc/reference.md
@@ -3665,7 +3665,7 @@ implements trait `R`, casting `E` to the corresponding pointer type `&R` or
 represented as a pair of pointers: the vtable pointer for the `T`
 implementation of `R`, and the pointer value of `E`.
 
-An example of an trait object:
+An example of a trait object:
 
 ```
 trait Printable {