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+If you send a pull request / patch, please observe the following.
+
+## Licensing
+
+Since this crate is dual-licensed,
+[section 5 of the Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0#contributions)
+is considered to apply in the sense of Contributions being automatically
+under the Apache License 2.0 or MIT dual license (see the `COPYRIGHT` file).
+That is, by the act of offering a Contribution, you place your Contribution
+under the Apache License 2.0 or MIT dual license stated in the `COPYRIGHT`
+file. Please do not contribute if you aren't willing or allowed to license your
+contributions in this manner.
+
+You are encouraged to dedicate test code that you contribute to the Public
+Domain using the CC0 dedication. If you contribute test code that is not
+dedicated to the Public Domain, please be sure not to put it in a part of
+source code that the comments designate as being dedicated to the Public
+Domain.
+
+## Copyright Notices
+
+If you require the addition of your copyright notice, it's up to you to edit in
+your notice as part of your Contribution. Not adding a copyright notice is
+taken as a waiver of copyright notice.
+
+## No Encodings Beyond The Encoding Standard
+
+Please do not contribute implementations of encodings that are not specified
+in the [Encoding Standard](https://encoding.spec.whatwg.org/).
+
+For example, an implementation of UTF-7 is explicitly out of scope for this
+crate and is, therefore, provided by the [`charset`](https://crates.io/crates/charset)
+crate instead. For single-byte DOS encodings, please see the
+[`oem_cp`](https://crates.io/crates/oem_cp) crate.
+
+## Compatibility with Stable Rust
+
+Please ensure that your Contribution compiles with the latest stable-channel
+rustc.
+
+## rustfmt
+
+The `rustfmt` version used for this code is `rustfmt-nightly`. Please either
+use that version or avoid using `rustfmt` (so as not to reformat all the code).
+
+## Unit tests
+
+Please ensure that `cargo test` succeeds.