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diff --git a/compiler/rustc_error_codes/src/error_codes/E0451.md b/compiler/rustc_error_codes/src/error_codes/E0451.md
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+A struct constructor with private fields was invoked.
+
+Erroneous code example:
+
+```compile_fail,E0451
+mod bar {
+    pub struct Foo {
+        pub a: isize,
+        b: isize,
+    }
+}
+
+let f = bar::Foo{ a: 0, b: 0 }; // error: field `b` of struct `bar::Foo`
+                                //        is private
+```
+
+To fix this error, please ensure that all the fields of the struct are public,
+or implement a function for easy instantiation. Examples:
+
+```
+mod bar {
+    pub struct Foo {
+        pub a: isize,
+        pub b: isize, // we set `b` field public
+    }
+}
+
+let f = bar::Foo{ a: 0, b: 0 }; // ok!
+```
+
+Or:
+
+```
+mod bar {
+    pub struct Foo {
+        pub a: isize,
+        b: isize, // still private
+    }
+
+    impl Foo {
+        pub fn new() -> Foo { // we create a method to instantiate `Foo`
+            Foo { a: 0, b: 0 }
+        }
+    }
+}
+
+let f = bar::Foo::new(); // ok!
+```