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+# Available Feature Flags
+
+This crate has the following features which can be enabled.
+Each entry will explain the feature in more detail.
+
+1. [`base64`](#base64)
+2. [`chrono`](#chrono)
+3. [`guide`](#guide)
+4. [`hex`](#hex)
+5. [`indexmap`](#indexmap)
+6. [`json`](#json)
+7. [`macros`](#macros)
+8. [`time_0_3`](#time_0_3)
+
+## `base64`
+
+The `base64` feature enables serializing data in base64 format.
+
+This pulls in `base64` as a dependency.
+
+## `chrono`
+
+The `chrono` feature enables integration of `chrono` specific conversions.
+This includes support for the timestamp and duration types.
+
+This pulls in `chrono` as a dependency.
+
+## `guide`
+
+The `guide` feature enables inclusion of this user guide.
+The feature only changes the rustdoc output and enables no other effects.
+
+## `hex`
+
+The `hex` feature enables serializing data in hex format.
+
+This pulls in `hex` as a dependency.
+
+## `indexmap`
+
+The `indexmap` feature enables implementations of `indexmap` specific checks.
+This includes support for checking duplicate keys
+
+## `json`
+
+The `json` features enables JSON conversions from the `json` module.
+
+This pulls in `serde_json` as a dependency.
+
+## `macros`
+
+The `macros` features enables all helper macros and derives.
+It is enabled by default, since the macros provide a usability benefit, especially for `serde_as`.
+
+This pulls in `serde_with_macros` as a dependency.
+
+## `time_0_3`
+
+The `time_0_3` enables integration of `time` v0.3 specific conversions.
+This includes support for the timestamp and duration types.
+
+This pulls in `time` v0.3 as a dependency.