diff --git a/src/doc/guide.md b/src/doc/guide.md
index 387841ab3fcef..a889e4233b7ce 100644
--- a/src/doc/guide.md
+++ b/src/doc/guide.md
@@ -1066,6 +1066,7 @@ feature of Rust, and are used throughout the standard library. Enums look
 like this:
 
 ```
+#[deriving(Eq, PartialEq)]
 enum Ordering {
     Less,
     Equal,
@@ -1073,6 +1074,9 @@ enum Ordering {
 }
 ```
 
+We will talk about `#[deriving(Eq, PartialEq)]` later, for now we can read
+it as "allow us to use `==` for comparisons."
+
 This is an enum that is provided by the Rust standard library. An `Ordering`
 can only be _one_ of `Less`, `Equal`, or `Greater` at any given time. Here's
 an example: