Add feature gate

1 files changed, 4 insertions, 1 deletions

diff --git a/src/doc/reference.md b/src/doc/reference.md
index 95a58686cf2..83849574260 100644
--- a/src/doc/reference.md
+++ b/src/doc/reference.md
@@ -1178,10 +1178,11 @@ let px: i32 = match p { Point(x, _) => x };
 ```
 
 A _unit-like struct_ is a structure without any fields, defined by leaving off
-the list of fields entirely. Such structure implicitly defines a constant of
+the list of fields entirely. Such a structure implicitly defines a constant of
 its type with the same name. For example:
 
 ```
+# #![feature(braced_empty_structs)]
 struct Cookie;
 let c = [Cookie, Cookie {}, Cookie, Cookie {}];
 ```
@@ -1189,6 +1190,7 @@ let c = [Cookie, Cookie {}, Cookie, Cookie {}];
 is equivalent to
 
 ```
+# #![feature(braced_empty_structs)]
 struct Cookie {}
 const Cookie: Cookie = Cookie {};
 let c = [Cookie, Cookie {}, Cookie, Cookie {}];
@@ -2420,6 +2422,7 @@ The currently implemented features of the reference compiler are:
                               terms of encapsulation).
 * - `default_type_parameter_fallback` - Allows type parameter defaults to
                                         influence type inference.
+* - `braced_empty_structs` - Allows use of empty structs with braces.
 
 If a feature is promoted to a language feature, then all existing programs will
 start to receive compilation warnings about `#![feature]` directives which enabled