diff --git a/src/introduction.md b/src/introduction.md
index 7a874c33d..585d51134 100644
--- a/src/introduction.md
+++ b/src/introduction.md
@@ -79,6 +79,12 @@ information. These conventions are documented here.
 
   An *example term* is an example of a term beind defined.
 
+* Differences in the language by which edition the crate is compiled under are
+  in a blockquote that start with the words "Edition Differences:" in **bold**.
+
+  > **Edition Differences**: In the 2015 edition, this syntax is valid that is
+  > disallowed as of the 2018 edition.
+
 * Notes that contain useful information about the state of the book or point out
   useful, but mostly out of scope, information are in blockquotes that start
   with the word "Note:" in **bold**.
diff --git a/src/items/associated-items.md b/src/items/associated-items.md
index 707524385..2f76436e6 100644
--- a/src/items/associated-items.md
+++ b/src/items/associated-items.md
@@ -134,10 +134,9 @@ let circle_shape = Circle::new();
 let bounding_box = circle_shape.bounding_box();
 ```
 
-> NOTE: Until the 2018 edition, it was possible to declare trait methods with
-> anonymous parameters (e.g. `fn foo(u8)`). This was deprecated and disallowed
-> in the 2018 edition. All parameters must have an argument name. See [RFC
-> 1685](https://github.com/rust-lang/rfcs/pull/1685).
+> **Edition Differences**: In the 2015 edition, it is possible to declare trait
+> methods with anonymous parameters (e.g. `fn foo(u8)`). This is deprecated and
+> an error as of the 2018 edition. All parameters must have an argument name.
 
 ## Associated Types