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diff --git a/ctr-std/src/keyword_docs.rs b/ctr-std/src/keyword_docs.rs
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+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[doc(keyword = "fn")]
+//
+/// The `fn` keyword.
+///
+/// The `fn` keyword is used to declare a function.
+///
+/// Example:
+///
+/// ```rust
+/// fn some_function() {
+///     // code goes in here
+/// }
+/// ```
+///
+/// For more information about functions, take a look at the [Rust Book][book].
+///
+/// [book]: https://doc.rust-lang.org/book/second-edition/ch03-03-how-functions-work.html
+mod fn_keyword { }
+
+#[doc(keyword = "let")]
+//
+/// The `let` keyword.
+///
+/// The `let` keyword is used to declare a variable.
+///
+/// Example:
+///
+/// ```rust
+/// # #![allow(unused_assignments)]
+/// let x = 3; // We create a variable named `x` with the value `3`.
+/// ```
+///
+/// By default, all variables are **not** mutable. If you want a mutable variable,
+/// you'll have to use the `mut` keyword.
+///
+/// Example:
+///
+/// ```rust
+/// # #![allow(unused_assignments)]
+/// let mut x = 3; // We create a mutable variable named `x` with the value `3`.
+///
+/// x += 4; // `x` is now equal to `7`.
+/// ```
+///
+/// For more information about the `let` keyword, take a look at the [Rust Book][book].
+///
+/// [book]: https://doc.rust-lang.org/book/second-edition/ch03-01-variables-and-mutability.html
+mod let_keyword { }