diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..3cba94b
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,35 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+<!-- markdownlint-disable no-duplicate-heading -->
+
+## Unreleased
+
+### Breaking CHanges
+
+- `parser::Config::allow_implicit_map` has been renamed to
+  `allow_implicit_map_at_root`.
+- These types are now marked as `#[non_exhaustive]`:
+  - `parser::Config`
+  - `ser::Config`
+  - `writer::Config`
+
+### Fixes
+
+- Raw strings and byte strings without any `#`s can now be used. E.g., `r"\"`
+- Implicit map support now supports serializing and deserializing any map-like
+  type.
+
+### Added
+
+- When the new flag `ser::Config::anonymous_structs` is enabled, structures will
+  be written without their name.
+
+
+## v0.1.0
+
+Initial release.
\ No newline at end of file
diff --git a/src/ser.rs b/src/ser.rs
index 6946e68..187481b 100644
--- a/src/ser.rs
+++ b/src/ser.rs
@@ -242,7 +242,6 @@ where
         Ok(self)
     }
 
-    // TODO implicit_map_at_root
     fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
         let is_implicit_map = self.implicit_map_at_root;
         self.mark_value_seen();
@@ -465,8 +464,12 @@ pub struct Config {
 }
 
 impl Config {
-    pub fn new() -> Self {
-        Self::default()
+    pub const fn new() -> Self {
+        Self {
+            writer: writer::Config::Compact,
+            implicit_map_at_root: false,
+            anonymous_structs: false,
+        }
     }
 
     pub fn pretty() -> Self {