diff --git a/src/librustc_error_codes/error_codes/E0321.md b/src/librustc_error_codes/error_codes/E0321.md
index 49cec94430bca..bfcdabfe9de7a 100644
--- a/src/librustc_error_codes/error_codes/E0321.md
+++ b/src/librustc_error_codes/error_codes/E0321.md
@@ -1,5 +1,7 @@
 A cross-crate opt-out trait was implemented on something which wasn't a struct
-or enum type. Erroneous code example:
+or enum type.
+
+Erroneous code example:
 
 ```compile_fail,E0321
 #![feature(optin_builtin_traits)]
diff --git a/src/librustc_error_codes/error_codes/E0322.md b/src/librustc_error_codes/error_codes/E0322.md
index d2ee426763e7b..ccef8681dd601 100644
--- a/src/librustc_error_codes/error_codes/E0322.md
+++ b/src/librustc_error_codes/error_codes/E0322.md
@@ -1,3 +1,13 @@
+The `Sized` trait was implemented explicitly.
+
+Erroneous code example:
+
+```compile_fail,E0322
+struct Foo;
+
+impl Sized for Foo {} // error!
+```
+
 The `Sized` trait is a special trait built-in to the compiler for types with a
 constant size known at compile-time. This trait is automatically implemented
 for types as needed by the compiler, and it is currently disallowed to