Fix minor typo

diff --git a/src/doc/reference.md b/src/doc/reference.md
index 938a74a16219ce8f8d8c28111baa202f6445459c..dfdfe328820289cdbd284c71e8146ac2b6d0fed7 100644 (file)
--- a/src/doc/reference.md
+++ b/src/doc/reference.md
@@ -659,7 +659,7 @@ thing they can be used for is to implement derive on your own types. See
 Procedural macros involve a few different parts of the language and its
 standard libraries. First is the `proc_macro` crate, included with Rust,
 that defines an interface for building a procedural macro. The
-`#[proc_macro_derive(Foo)]` attribute is used to mark the the deriving
+`#[proc_macro_derive(Foo)]` attribute is used to mark the deriving
 function. This function must have the type signature:
 
 ```rust,ignore