diff --git a/CHANGELOG.md b/CHANGELOG.md
index a4dc39a..2ef1efb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## v0.3.0 (pre-release)
 
+- Introduce `cgp_type!` macro for defining simple abstract CGP types - [#55](https://github.com/contextgeneric/cgp/pull/55)
+    - Use `cgp_type!` to derive `HasErrorType` and `HasRuntimeType`.
+
 - Implement `ErrorWrapper` on generic `ErrorRaiser` providers - [#54](https://github.com/contextgeneric/cgp/pull/54)
     - Implement `ErrorWrapper` for the following providers: `DebugError`, `DisplayError`,
       `DebugAnyhowError`, `DisplayAnyhowError`, `RaiseAnyhowError`,
diff --git a/crates/cgp-error/src/traits/has_error_type.rs b/crates/cgp-error/src/traits/has_error_type.rs
index a53021f..967a90f 100644
--- a/crates/cgp-error/src/traits/has_error_type.rs
+++ b/crates/cgp-error/src/traits/has_error_type.rs
@@ -19,6 +19,9 @@ cgp_type! {
        The `Error` associated type is also required to implement [`Debug`].
        This is to allow `Self::Error` to be used in calls like `.unwrap()`,
        as well as for simpler error logging.
+
+       More details about how to use `HasErrorType` is available at
+       <https://patterns.contextgeneric.dev/error-handling.html>
     */
     Error: Debug
 }