+#### Define: `apt::key`
+
+Manages the GPG keys that Apt uses to authenticate packages.
+
+The `apt::key` define makes use of the `apt_key` type, but includes extra functionality to help prevent duplicate keys.
+
+##### Parameters (all optional)
+
+* `content`: Supplies the entire GPG key. Useful in case the key can't be fetched from a remote location and using a file resource is inconvenient. Valid options: a string. Default: undef.
+
+* `ensure`: Specifies whether the key should exist. Valid options: 'present' and 'absent'. Default: 'present'.
+
+* `id`: Specifies a GPG key to authenticate Apt package signatures. Valid options: a string containing a key ID (8 or 16 hexadecimal characters, optionally prefixed with "0x") or a full key fingerprint (40 hexadecimal characters). Default: $title.
+
+* `options`: Passes additional options to `apt-key adv --keyserver-options`. Valid options: a string. Default: undef.
+
+* `source`: Specifies the location of an existing GPG key file to copy. Valid options: a string containing a URL (ftp://, http://, or https://) or an absolute path. Default: undef.
+
+* `server`: Specifies a keyserver to provide the GPG key. Valid options: a string containing a domain name or a full URL (http://, https://, or hkp://). Default: 'keyserver.ubuntu.com'.
+
+* `key`: Specifies a GPG key to authenticate Apt package signatures. Valid options: a string containing a key ID (8 or 16 hexadecimal characters, optionally prefixed with "0x") or a full key fingerprint (40 hexadecimal characters). Default: undef. **Note** This parameter is deprecated and will be removed in a future release.
+
+* `key_content`: Supplies the entire GPG key. Useful in case the key can't be fetched from a remote location and using a file resource is inconvenient. Valid options: a string. Default: undef. **Note** This parameter is deprecated and will be removed in a future release.
+
+* `key_source`: Specifies the location of an existing GPG key file to copy. Valid options: a string containing a URL (ftp://, http://, or https://) or an absolute path. Default: undef. **Note** This parameter is deprecated and will be removed in a future release.
+
+* `key_server`: Specifies a keyserver to provide the GPG key. Valid options: a string containing a domain name or a full URL (http://, https://, or hkp://). Default: 'keyserver.ubuntu.com'. **Note** This parameter is deprecated and will be removed in a future release.
+
+* `key_options`: Passes additional options to `apt-key adv --keyserver-options`. Valid options: a string. Default: undef. **Note** This parameter is deprecated and will be removed in a future release.
+
+#### Define: `apt::pin`
+
+Manages Apt pins.
+
+**Note:** For context on these parameters, we recommend reading the man page ['apt_preferences(5)'](http://linux.die.net/man/5/apt_preferences)
+
+##### Parameters (all optional)
+
+* `codename`: Specifies the distribution (lsbdistcodename) of the Apt repository. Valid options: a string. Default: ''.
+
+* `component`: Names the licensing component associated with the packages in the directory tree of the Release file. Valid options: a string. Default: ''.
+
+* `ensure`: Specifies whether the pin should exist. Valid options: 'file', 'present', and 'absent'. Default: 'present'.
+
+* `explanation`: Supplies a comment to explain the pin. Valid options: a string. Default: "${caller_module_name}: ${name}".
+
+* `label`: Names the label of the packages in the directory tree of the Release file. Valid options: a string (most commonly, 'debian'). Default: ''.
+
+* `order`: Determines the order in which Apt processes the pin file. Files with lower order numbers are loaded first. Valid options: an integer. Default: 50.
+
+* `origin`: Tells Apt to prefer packages from the specified server. Valid options: a string containing a hostname. Default: ''.
+
+* `originator`: Names the originator of the packages in the directory tree of the Release file. Valid options: a string (most commonly, 'debian'). Default: ''.
+
+* `packages`: Specifies which package(s) to pin. Valid options: a string or an array. Default: '*'.
+
+* `priority`: Sets the priority of the package. If multiple versions of a given package are available, `apt-get` installs the one with the highest priority number (subject to dependency constraints). Valid options: an integer. Default: 0.
+
+* `release`: Tells Apt to prefer packages that support the specified release. Typical values include 'stable', 'testing', and 'unstable' Valid options: a string. Default: ''.
+
+* `release_version`: Tells Apt to prefer packages that support the specified operating system release version (e.g., Debian release version 7). Valid options: a string. Default: ''.
+
+* `version`: Tells Apt to prefer a specified package version or version range. Valid options: a string. Default: ''.
+
+#### Define: `apt::ppa`
+
+Manages PPA repositories using `add-apt-repository`. Not supported on Debian.
+
+##### Parameters (all optional, except where specified)
+
+* `ensure`: Specifies whether the PPA should exist. Valid options: 'present' and 'absent'. Default: 'present'.
+
+* `options`: Supplies options to be passed to the `add-apt-repository` command. Valid options: a string. Defaults:
+
+ * Lucid: undef
+ * All others: '-y'
+
+* `package_manage`: Specifies whether Puppet should manage the package that provides `apt-add-repository`. Valid options: 'true' and 'false'. Default: 'false'.
+
+* `package_name`: Names the package that provides the `apt-add-repository` command. Valid options: a string. Defaults:
+
+ * Lucid and Precise: 'python-software-properties'
+ * Trusty, Utopic, and Vivid: 'software-properties-common'
+ * All others: undef
+
+* `release`: *Optional if lsb-release is installed (unless you're using a different release than indicated by lsb-release, e.g., Linux Mint).* Specifies the operating system of your node. Valid options: a string containing a valid LSB distribution codename. Default: "$lsbdistcodename".
+
+#### Define: `apt:setting`
+
+Manages Apt configuration files.
+
+##### Parameters
+
+* `content`: *Required, unless `source` is set.* Directly supplies content for the configuration file. Cannot be used in combination with `source`. Valid options: see the `content` attribute of [Puppet's native `file` type](https://docs.puppetlabs.com/references/latest/type.html#file-attribute-content). Default: undef.
+
+* `ensure`: Specifies whether the file should exist. Valid options: 'present', 'absent', and 'file'. Default: 'file'.
+
+* `notify_update`: *Optional.* Specifies whether to trigger an `apt-get update` run. Valid options: 'true' and 'false'. Default: 'true'.
+
+* `priority`: *Optional.* Determines the order in which Apt processes the configuration file. Files with higher priority numbers are loaded first. Valid options: an integer or zero-padded integer. Default: 50.
+
+* `source`: *Required, unless `content` is set.* Specifies a source file to supply the content of the configuration file. Cannot be used in combination with `content`. Valid options: see the `source` attribute of [Puppet's native `file` type](https://docs.puppetlabs.com/references/latest/type.html#file-attribute-source). Default: undef.
+
+#### Define: `apt::source`
+
+Manages the Apt sources in `/etc/apt/sources.list.d/`.
+
+##### Parameters (all optional, except where specified)
+
+* `allow_unsigned`: Specifies whether to authenticate packages from this release, even if the Release file is not signed or the signature can't be checked. Valid options: 'true' and 'false'. Default: 'false'.
+
+* `architecture`: Tells Apt to only download information for specified architectures. Valid options: a string containing one or more architecture names, separated by commas (e.g., 'i386' or 'i386,alpha,powerpc'). Default: undef (if unspecified, Apt downloads information for all architectures defined in the Apt::Architectures option).
+
+* `comment`: Supplies a comment for adding to the Apt source file. Valid options: a string. Default: $name.
+
+* `ensure`: Specifies whether the Apt source file should exist. Valid options: 'present' and 'absent'. Default: 'present'.
+
+* `key`: Creates a declaration of the apt::key define Valid options: a string to be passed to the `id` parameter of the `apt::key` define, or a hash of `parameter => value` pairs to be passed to `apt::key`'s `id`, `server`, `content`, `source`, and/or `options` parameters. Default: undef.
+
+* `include`: Configures include options. Valid options: a hash of available keys. Default: {}. Available keys are:
+
+ * 'deb' - Specifies whether to request the distribution's compiled binaries. Valid options: 'true' and 'false'. Default: 'true'.
+
+ * 'src' - Specifies whether to request the distribution's uncompiled source code. Valid options: 'true' and 'false'. Default: 'false'.
+
+* `location`: *Required, unless `ensure` is set to 'absent'.* Specifies an Apt repository. Valid options: a string containing a repository URL. Default: undef.
+
+* `pin`: Creates a declaration of the apt::pin define Valid options: a number or string to be passed to the `id` parameter of the `apt::pin` define, or a hash of `parameter => value` pairs to be passed to `apt::pin`'s corresponding parameters. Default: undef.
+
+* `release`: Specifies a distribution of the Apt repository. Valid options: a string. Default: "$lsbdistcodename".
+
+ * `repos`: Specifies a component of the Apt repository. Valid options: a string. Default: 'main'.
+
+* `include_deb`: Specify whether to request the distrubution's compiled binaries. Valid options: 'true' and 'false'. Default: undef. **Note**: This parameter is deprecated and will be removed in future versions of the module.
+
+* `include_src`: Specifies whether to request the distribution's uncompiled source code. Valid options: 'true' and 'false'. Default: undef. **Note**: This parameter is deprecated and will be removed in future versions of the module.
+
+* `required_packages`: Installs packages required for this Apt source via an exec. Default: 'false'. **Note**: This parameter is deprecated and will be removed in future versions of the module.
+
+* `key_content`: Specifies the content to be passed to `apt::key`. Default: undef. **Note**: This parameter is deprecated and will be removed in future versions of the module.
+
+* `key_server`: Specifies the server to be passed to `apt::key`. Default: undef. **Note**: This parameter is deprecated and will be removed in future versions of the module.
+
+* `key_source`: Specifies the source to be passed to `apt::key`. Default: undef. **Note**: This parameter is deprecated and will be removed in future versions of the module.
+
+* `trusted_source`: Specifies whether to authenticate packages from this release, even if the Release file is not signed or the signature can't be checked. Valid options: 'true' and 'false'. Default: undef. This parameter is **deprecated** and will be removed in a future version of the module.
+
+#### Type: `apt_key`
+
+Manages the GPG keys that Apt uses to authenticate packages.
+
+**Note:** In most cases, we recommend using the `apt::key` define. It makes use of the `apt_key` type, but includes extra functionality to help prevent duplicate keys.
+
+##### Parameters (all optional)
+
+* `content`: Supplies the entire GPG key. Useful in case the key can't be fetched from a remote location and using a file resource is inconvenient. Cannot be used in combination with `source`. Valid options: a string. Default: undef.
+
+* `options`: Passes additional options to `apt-key adv --keyserver-options`. Valid options: a string. Default: undef.
+
+* `server`: Specifies a keyserver to provide Puppet's GPG key. Valid options: a string containing a domain name or a full URL. Default: 'keyserver.ubuntu.com'.
+
+* `source`: Specifies the location of an existing GPG key file to copy. Cannot be used in combination with `content`. Valid options: a string containing a URL (ftp://, http://, or https://) or an absolute path. Default: undef.
+
+## Limitations
+
+This module is tested and officially supported on Debian 6 and 7 and Ubuntu 10.04, 12.04, and 14.04. Testing on other platforms has been light and cannot be guaranteed.
+
+## Development
+Puppet Labs modules on the Puppet Forge are open projects, and community contributions are essential for keeping them great. We can't access the huge number of platforms and myriad hardware, software, and deployment configurations that Puppet is intended to serve. We want to keep it as easy as possible to contribute changes so that our modules work in your environment. There are a few guidelines that we need contributors to follow so that we can have a chance of keeping on top of things.
+
+For more information, see our [module contribution guide.](https://docs.puppetlabs.com/forge/contributing.html)
+
+To see who's already involved, see the [list of contributors.](https://github.com/puppetlabs/puppetlabs-apt/graphs/contributors)